XML 48 R38.htm IDEA: XBRL DOCUMENT v3.10.0.1
Available for Sale Securities (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 8,288,807 $ 8,369,138 $ 8,288,807 $ 8,369,138 $ 8,369,075
Available for sale securities 8,072,014 8,383,199 8,072,014 8,383,199 8,321,578
Available-for-sale Securities, Gross Unrealized Gain 23,812 64,797 23,812 64,797 41,519
Available-for-sale Securities, Gross Unrealized Loss (240,605) (50,736) (240,605) (50,736) (88,625)
Available-for-Sale Securities, Other Than Temporary Impairments 0 0 0 0 (391)
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value $ 8,000,000 7,000,000 $ 8,000,000 7,000,000 $ 7,300,000
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]          
Available-for-sale Securities, Debt Maturities, Nominal Yield 2.21%   2.21%    
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Proceeds from sales of available for sale securities $ 45,293 265,632 $ 232,826 966,044  
Available-for-sale Securities, Gross realized gains 250 2,768 700 7,623  
Available-for-sale Securities, Gross realized losses 0 (281) (1,502) (2,707)  
Available-for-sale Securities, Related federal and state income tax expense $ 64 $ 967 $ (204) $ 1,912  
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 550 383 550 383 534
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 3,748,528 $ 2,878,675 $ 3,748,528 $ 2,878,675 $ 3,773,942
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,572,192 1,373,859 3,572,192 1,373,859 2,118,360
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 7,320,720 4,252,534 7,320,720 4,252,534 5,892,302
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 78,683 23,486 78,683 23,486 30,648
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 161,922 27,250 161,922 27,250 58,368
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 240,605 50,736 240,605 50,736 89,016
Fixed Maturity Securities [Member]          
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis 74,694   74,694    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 1,071,315   1,071,315    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 1,449,084   1,449,084    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 341,147   341,147    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost 2,936,240   2,936,240    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 73,929   73,929    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 1,043,919   1,043,919    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 1,413,692   1,413,692    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 333,437   333,437    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value $ 2,864,977   $ 2,864,977    
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield 1.70%   1.70%    
Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield 2.02%   2.02%    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield 2.24%   2.24%    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield 2.42%   2.42%    
Available-for-sale Securities, Debt Maturities, Nominal Yield 2.17%   2.17%    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 7.18   7.18    
U.S. Treasury [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 495 1,000 $ 495 1,000 1,000
Available for sale securities 490 999 490 999 1,000
Available-for-sale Securities, Gross Unrealized Gain 0 0 0 0 0
Available-for-sale Securities, Gross Unrealized Loss (5) (1) (5) (1) 0
Available-for-Sale Securities, Other Than Temporary Impairments 0 $ 0 0 $ 0 $ 0
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis 0   0    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 495   495    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 0   0    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 0   0    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost 495   495    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 0   0    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 490   490    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 0   0    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 0   0    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value $ 490   $ 490    
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield 0.00%   0.00%    
Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield 1.99%   1.99%    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield 0.00%   0.00%    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield 0.00%   0.00%    
Available-for-sale Securities, Debt Maturities, Nominal Yield 1.99%   1.99%    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 1.34   1.34    
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1 1 1 1 0
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 490 $ 999 $ 490 $ 999 $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0 0 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 490 999 490 999 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 5 1 5 1 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0 0 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 5 1 5 1 0
Municipal and other tax-exempt securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 4,269 28,411 4,269 28,411 27,182
Available for sale securities 4,349 28,368 4,349 28,368 27,080
Available-for-sale Securities, Gross Unrealized Gain 81 240 81 240 181
Available-for-sale Securities, Gross Unrealized Loss (1) (283) (1) (283) (283)
Available-for-Sale Securities, Other Than Temporary Impairments 0 $ 0 0 $ 0 $ 0
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis 0   0    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 0   0    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 0   0    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 4,269   4,269    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost 4,269   4,269    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 0   0    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 0   0    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 0   0    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 4,349   4,349    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value $ 4,349   $ 4,349    
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield [2] 0.00%   0.00%    
Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield [2] 0.00%   0.00%    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield [2] 0.00%   0.00%    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield [2],[3] 5.60%   5.60%    
Available-for-sale Securities, Debt Maturities, Nominal Yield [2] 5.60%   5.60%    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 18.72   18.72    
Available-for-sale Securities, Debt Maturities, Effective tax rate for nominal yield calculation 25.00%   25.00%    
Available-for-sale Securities, Debt Maturities, Number of days for interest rates to reset 35 days        
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2 11 2 11 19
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,046 $ 576 $ 1,046 $ 576 $ 12,765
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 4,785 0 4,785 4,802
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,046 5,361 1,046 5,361 17,567
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 1 1 1 18
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 282 0 282 265
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 1 283 1 283 283
Commercial mortgage-backed securities guaranteed by U.S. government agencies [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 2,905,974 2,899,828 2,905,974 2,899,828 2,858,885
Available for sale securities 2,834,691 2,889,346 2,834,691 2,889,346 2,834,961
Available-for-sale Securities, Gross Unrealized Gain 1,363 5,577 1,363 5,577 1,963
Available-for-sale Securities, Gross Unrealized Loss (72,646) (16,059) (72,646) (16,059) (25,887)
Available-for-Sale Securities, Other Than Temporary Impairments 0 $ 0 0 $ 0 $ 0
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis 74,694   74,694    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 1,070,820   1,070,820    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 1,449,084   1,449,084    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 311,376   311,376    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost 2,905,974   2,905,974    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 73,929   73,929    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 1,043,429   1,043,429    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 1,413,692   1,413,692    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 303,641   303,641    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value $ 2,834,691   $ 2,834,691    
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield 1.70%   1.70%    
Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield 2.02%   2.02%    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield 2.24%   2.24%    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield 2.45%   2.45%    
Available-for-sale Securities, Debt Maturities, Nominal Yield 2.17%   2.17%    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 7.11   7.11    
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 220 137 220 137 185
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,174,544 $ 1,154,911 $ 1,174,544 $ 1,154,911 $ 1,465,703
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,238,848 559,984 1,238,848 559,984 652,296
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 2,413,392 1,714,895 2,413,392 1,714,895 2,117,999
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 24,982 7,194 24,982 7,194 11,824
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 47,664 8,865 47,664 8,865 14,063
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 72,646 16,059 72,646 16,059 25,887
Other debt securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 25,502 4,400 25,502 4,400 25,500
Available for sale securities 25,447 4,153 25,447 4,153 25,481
Available-for-sale Securities, Gross Unrealized Gain 11 0 11 0 50
Available-for-sale Securities, Gross Unrealized Loss (66) (247) (66) (247) (69)
Available-for-Sale Securities, Other Than Temporary Impairments 0 $ 0 0 $ 0 $ 0
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis 0   0    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 0   0    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 0   0    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 25,502   25,502    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost 25,502   25,502    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 0   0    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 0   0    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 0   0    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 25,447   25,447    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value $ 25,447   $ 25,447    
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield 0.00%   0.00%    
Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield 0.00%   0.00%    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield 0.00%   0.00%    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield [3] 1.59%   1.59%    
Available-for-sale Securities, Debt Maturities, Nominal Yield 1.59%   1.59%    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 13.93   13.93    
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2 2 2 2 2
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 0 $ 0 $ 0 $ 19,959
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 20,435 4,153 20,435 4,153 472
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 20,435 4,153 20,435 4,153 20,431
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0 0 0 41
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 66 247 66 247 28
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 66 247 66 247 69
Residential Mortgage Backed Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 5,352,567 5,405,134 5,352,567 5,405,134 5,429,459
Available for sale securities 5,207,037 5,426,378 5,207,037 5,426,378 5,402,373
Available-for-sale Securities, Gross Unrealized Gain 22,357 54,642 22,357 54,642 35,605
Available-for-sale Securities, Gross Unrealized Loss (167,887) (33,398) (167,887) (33,398) (62,300)
Available-for-Sale Securities, Other Than Temporary Impairments 0 $ 0 0 $ 0 $ (391)
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]          
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost 5,352,567   5,352,567    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value $ 5,207,037   $ 5,207,037    
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]          
Available-for-sale Securities, Debt Maturities, Nominal Yield [4] 2.24%   2.24%    
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities     4 years 4 months 24 days    
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 325 141 325 141 217
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,572,448 $ 1,718,517 $ 2,572,448 $ 1,718,517 $ 2,274,604
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,312,909 803,509 2,312,909 803,509 1,458,587
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 4,885,357 2,522,026 4,885,357 2,522,026 3,733,191
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 53,695 15,594 53,695 15,594 18,758
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 114,192 17,804 114,192 17,804 43,933
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 167,887 33,398 167,887 33,398 62,691
U.S. government agency residential mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 5,297,635 5,324,337 5,297,635 5,324,337 5,355,148
Available for sale securities 5,132,352 5,326,384 5,132,352 5,326,384 5,309,152
Available-for-sale Securities, Gross Unrealized Gain 2,604 35,445 2,604 35,445 16,304
Available-for-sale Securities, Gross Unrealized Loss (167,887) (33,398) (167,887) (33,398) (62,300)
Available-for-Sale Securities, Other Than Temporary Impairments $ 0 $ 0 $ 0 $ 0 $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 325 141 325 141 209
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,572,448 $ 1,718,517 $ 2,572,448 $ 1,718,517 $ 2,268,706
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,312,909 803,509 2,312,909 803,509 1,458,587
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 4,885,357 2,522,026 4,885,357 2,522,026 3,727,293
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 53,695 15,594 53,695 15,594 18,367
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 114,192 17,804 114,192 17,804 43,933
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 167,887 33,398 167,887 33,398 62,300
U.S. government agency residential mortgage-backed securities [Member] | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 3,057,570 3,103,869 3,057,570 3,103,869 3,021,551
Available for sale securities 2,959,457 3,108,822 2,959,457 3,108,822 2,997,563
Available-for-sale Securities, Gross Unrealized Gain 1,653 25,510 1,653 25,510 11,549
Available-for-sale Securities, Gross Unrealized Loss (99,766) (20,557) (99,766) (20,557) (35,537)
Available-for-Sale Securities, Other Than Temporary Impairments $ 0 $ 0 $ 0 $ 0 $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 188 81 188 81 113
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,584,010 $ 1,054,171 $ 1,584,010 $ 1,054,171 $ 1,203,041
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,277,814 480,994 1,277,814 480,994 824,029
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 2,861,824 1,535,165 2,861,824 1,535,165 2,027,070
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 32,919 10,288 32,919 10,288 9,618
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 66,847 10,269 66,847 10,269 25,919
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 99,766 20,557 99,766 20,557 35,537
U.S. government agency residential mortgage-backed securities [Member] | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 1,562,569 1,331,212 1,562,569 1,331,212 1,545,971
Available for sale securities 1,512,928 1,330,159 1,512,928 1,330,159 1,531,009
Available-for-sale Securities, Gross Unrealized Gain 501 6,630 501 6,630 3,148
Available-for-sale Securities, Gross Unrealized Loss (50,142) (7,683) (50,142) (7,683) (18,110)
Available-for-Sale Securities, Other Than Temporary Impairments $ 0 $ 0 $ 0 $ 0 $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 99 42 99 42 69
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 702,707 $ 477,823 $ 702,707 $ 477,823 $ 863,778
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 781,589 198,478 781,589 198,478 385,816
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,484,296 676,301 1,484,296 676,301 1,249,594
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 15,450 3,546 15,450 3,546 7,297
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 34,692 4,137 34,692 4,137 10,813
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 50,142 7,683 50,142 7,683 18,110
U.S. government agency residential mortgage-backed securities [Member] | Government National Mortgage Association Certificates and Obligations (GNMA) [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 677,496 864,256 677,496 864,256 787,626
Available for sale securities 659,967 862,394 659,967 862,394 780,580
Available-for-sale Securities, Gross Unrealized Gain 450 3,254 450 3,254 1,607
Available-for-sale Securities, Gross Unrealized Loss (17,979) (5,116) (17,979) (5,116) (8,653)
Available-for-Sale Securities, Other Than Temporary Impairments $ 0 $ 0 $ 0 $ 0 $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 38 17 38 17 27
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 285,731 $ 166,565 $ 285,731 $ 166,565 $ 201,887
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 253,506 124,037 253,506 124,037 248,742
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 539,237 290,602 539,237 290,602 450,629
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 5,326 1,718 5,326 1,718 1,452
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 12,653 3,398 12,653 3,398 7,201
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 17,979 5,116 17,979 5,116 8,653
U.S. government agency residential mortgage-backed securities [Member] | Other [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost   25,000   25,000  
Available for sale securities   25,009   25,009  
Available-for-sale Securities, Gross Unrealized Gain   51   51  
Available-for-sale Securities, Gross Unrealized Loss   (42)   (42)  
Available-for-Sale Securities, Other Than Temporary Impairments   $ 0   $ 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   1   1  
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   $ 19,958   $ 19,958  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   0   0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   19,958   19,958  
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   42   42  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   0   0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   42   42  
Privately issued residential mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 54,932 80,797 54,932 80,797 74,311
Available for sale securities 74,685 99,994 74,685 99,994 93,221
Available-for-sale Securities, Gross Unrealized Gain 19,753 19,197 19,753 19,197 19,301
Available-for-sale Securities, Gross Unrealized Loss 0 0 0 0 0
Available-for-Sale Securities, Other Than Temporary Impairments $ 0 $ 0 $ 0 $ 0 $ (391)
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 0 [5] 0 [6] 0 [5] 0 [6] 8 [7]
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 [5] $ 0 [6] $ 0 [5] $ 0 [6] $ 5,898 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 [5] 0 [6] 0 [5] 0 [6] 0 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 0 [5] 0 [6] 0 [5] 0 [6] 5,898 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 [5] 0 [6] 0 [5] 0 [6] 391 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 [5] 0 [6] 0 [5] 0 [6] 0 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 0 [5] 0 [6] $ 0 [5] 0 [6] 391 [7]
Perpetual preferred stock [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost   12,562   12,562 12,562
Available for sale securities   16,245   16,245 15,767
Available-for-sale Securities, Gross Unrealized Gain   3,683   3,683 3,205
Available-for-sale Securities, Gross Unrealized Loss   0   0 0
Available-for-Sale Securities, Other Than Temporary Impairments   $ 0   $ 0 $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   0   0 0
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   $ 0   $ 0 $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   0   0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   0   0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0   0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   0   0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   0   0 0
Equity securities and mutual funds [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost   17,803   17,803 14,487
Available for sale securities   17,710   17,710 14,916
Available-for-sale Securities, Gross Unrealized Gain   655   655 515
Available-for-sale Securities, Gross Unrealized Loss   (748)   (748) (86)
Available-for-Sale Securities, Other Than Temporary Impairments   $ 0   $ 0 $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   91   91 111
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   $ 3,672   $ 3,672 $ 911
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   1,428   1,428 2,203
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   5,100   5,100 3,114
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   696   696 7
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   52   52 79
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ 748   $ 748 $ 86
[1] Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
[2] Calculated on a taxable equivalent basis using a 25 percent effective tax rate.
[3] Nominal yield on municipal and other tax-exempt securities and other debt securities with contractual maturity dates over ten years are based on variable rates which generally are reset within 35 days.
[4] The nominal yield on mortgage-backed securities is based upon prepayment assumptions at the purchase date. Actual yields earned may differ significantly based upon actual prepayments. See Quarterly Financial Summary –– Unaudited following for current yields on available for sale securities portfolio.
[5] Includes securities for which an unrealized loss remains in AOCI after an other-than-temporary credit loss has been recognized in income.
[6] Includes securities for which an unrealized loss remains in AOCI after an other-than-temporary credit loss has been recognized in income.
[7] Includes securities for which an unrealized loss remains in AOCI after an other-than-temporary credit loss has been recognized in income.