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Securities, Available for Sale (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) Position | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Position | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) Position
Debt securities, available-for-sale [Abstract] |  |  |  |  |
Amortized cost | $ 1,227,513 |  | $ 1,227,513 |  |
Unrealized gains | 926 |  | 926 |  |
Unrealized losses | 35,500 |  | 35,500 |  |
Estimated fair value | 1,192,939 |  | 1,192,939 |  |
Total available-for-sale securities [Abstract] |  |  |  |  |
Amortized cost |  |  |  |  | $ 1,266,165
Unrealized gains |  |  |  |  | 5,893
Unrealized losses |  |  |  |  | 16,133
Estimated fair value | 1,192,939 |  | 1,192,939 |  | 1,255,925
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | 727,989 |  | 727,989 |  | 633,766
12 months or longer | 406,015 |  | 406,015 |  | 386,818
Total | 1,134,004 |  | 1,134,004 |  | 1,020,584
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | (18,424) |  | (18,424) |  | (5,481)
12 months or longer | (17,076) |  | (17,076) |  | (10,652)
Total | $ (35,500) |  | $ (35,500) |  | $ (16,133)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |  |
Less than 12 months | Position | 174 |  | 174 |  | 134
12 months or longer | Position | 86 |  | 86 |  | 79
Total | Position | 260 |  | 260 |  | 213
OTTI loss realized on equity investment | $ 0 | $ 0 | $ 0 | $ 1,300 |
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |  |
Within one year | 79,927 |  | 79,927 |  |
From one to five years | 78,012 |  | 78,012 |  |
From five to ten years | 186,454 |  | 186,454 |  |
After ten years | 883,120 |  | 883,120 |  |
Amortized cost | 1,227,513 |  | 1,227,513 |  |
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |  |
Within one year | 79,698 |  | 79,698 |  |
From one to five years | 76,566 |  | 76,566 |  |
From five to ten years | 182,532 |  | 182,532 |  |
After ten years | 854,143 |  | 854,143 |  |
Fair value | 1,192,939 |  | 1,192,939 |  |
Federal Agency [Member] |  |  |  |  |
Debt securities, available-for-sale [Abstract] |  |  |  |  |
Amortized cost | 119,964 |  | 119,964 |  | $ 109,862
Unrealized gains | 0 |  | 0 |  | 0
Unrealized losses | 1,394 |  | 1,394 |  | 963
Estimated fair value | 118,570 |  | 118,570 |  | 108,899
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | 39,457 |  | 39,457 |  | 64,653
12 months or longer | 79,113 |  | 79,113 |  | 44,246
Total | 118,570 |  | 118,570 |  | 108,899
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | (526) |  | (526) |  | (242)
12 months or longer | (868) |  | (868) |  | (721)
Total | $ (1,394) |  | $ (1,394) |  | $ (963)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |  |
Less than 12 months | Position | 4 |  | 4 |  | 5
12 months or longer | Position | 6 |  | 6 |  | 4
Total | Position | 10 |  | 10 |  | 9
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | $ 119,964 |  | $ 119,964 |  | $ 109,862
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |  |
Fair value | 118,570 |  | 118,570 |  | 108,899
State & Municipal [Member] |  |  |  |  |
Debt securities, available-for-sale [Abstract] |  |  |  |  |
Amortized cost | 36,676 |  | 36,676 |  | 42,171
Unrealized gains | 28 |  | 28 |  | 62
Unrealized losses | 302 |  | 302 |  | 277
Estimated fair value | 36,402 |  | 36,402 |  | 41,956
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | 23,273 |  | 23,273 |  | 23,566
12 months or longer | 5,479 |  | 5,479 |  | 5,994
Total | 28,752 |  | 28,752 |  | 29,560
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | (232) |  | (232) |  | (200)
12 months or longer | (70) |  | (70) |  | (77)
Total | $ (302) |  | $ (302) |  | $ (277)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |  |
Less than 12 months | Position | 37 |  | 37 |  | 39
12 months or longer | Position | 8 |  | 8 |  | 8
Total | Position | 45 |  | 45 |  | 47
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | $ 36,676 |  | $ 36,676 |  | $ 42,171
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |  |
Fair value | 36,402 |  | 36,402 |  | 41,956
Mortgage-Backed [Member] |  |  |  |  |
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | 432,173 |  | 432,173 |  | 317,630
12 months or longer | 60,657 |  | 60,657 |  | 58,316
Total | 492,830 |  | 492,830 |  | 375,946
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | (11,590) |  | (11,590) |  | (2,381)
12 months or longer | (2,832) |  | (2,832) |  | (1,187)
Total | $ (14,422) |  | $ (14,422) |  | $ (3,568)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |  |
Less than 12 months | Position | 93 |  | 93 |  | 55
12 months or longer | Position | 26 |  | 26 |  | 24
Total | Position | 119 |  | 119 |  | 79
Mortgage-Backed, Government Sponsored Enterprises [Member] |  |  |  |  |
Debt securities, available-for-sale [Abstract] |  |  |  |  |
Amortized cost | $ 503,303 |  | $ 503,303 |  | $ 530,392
Unrealized gains | 307 |  | 307 |  | 1,406
Unrealized losses | 13,579 |  | 13,579 |  | 3,345
Estimated fair value | 490,031 |  | 490,031 |  | 528,453
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | 503,303 |  | 503,303 |  | 530,392
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |  |
Fair value | 490,031 |  | 490,031 |  | 528,453
Mortgage-Backed, U.S. Government Agency Securities [Member] |  |  |  |  |
Debt securities, available-for-sale [Abstract] |  |  |  |  |
Amortized cost | 30,232 |  | 30,232 |  | 26,363
Unrealized gains | 225 |  | 225 |  | 334
Unrealized losses | 843 |  | 843 |  | 223
Estimated fair value | 29,614 |  | 29,614 |  | 26,474
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | 30,232 |  | 30,232 |  | 26,363
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |  |
Fair value | 29,614 |  | 29,614 |  | 26,474
Collateralized Mortgage Obligations [Member] |  |  |  |  |
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | 233,086 |  | 233,086 |  | 227,917
12 months or longer | 260,766 |  | 260,766 |  | 275,303
Total | 493,852 |  | 493,852 |  | 503,220
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | (6,076) |  | (6,076) |  | (2,658)
12 months or longer | (13,306) |  | (13,306) |  | (8,521)
Total | $ (19,382) |  | $ (19,382) |  | $ (11,179)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |  |
Less than 12 months | Position | 40 |  | 40 |  | 35
12 months or longer | Position | 46 |  | 46 |  | 42
Total | Position | 86 |  | 86 |  | 77
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member] |  |  |  |  |
Debt securities, available-for-sale [Abstract] |  |  |  |  |
Amortized cost | $ 486,029 |  | $ 486,029 |  | $ 496,033
Unrealized gains | 234 |  | 234 |  | 254
Unrealized losses | 17,702 |  | 17,702 |  | 10,114
Estimated fair value | 468,561 |  | 468,561 |  | 486,173
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | 486,029 |  | 486,029 |  | 496,033
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |  |
Fair value | 468,561 |  | 468,561 |  | 486,173
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member] |  |  |  |  |
Debt securities, available-for-sale [Abstract] |  |  |  |  |
Amortized cost | 51,309 |  | 51,309 |  | 50,721
Unrealized gains | 132 |  | 132 |  | 165
Unrealized losses | 1,680 |  | 1,680 |  | 1,065
Estimated fair value | 49,761 |  | 49,761 |  | 49,821
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |  |
Amortized cost | 51,309 |  | 51,309 |  | 50,721
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |  |
Fair value | $ 49,761 |  | $ 49,761 |  | 49,821
Equity Securities [Member] |  |  |  |  |
Equity securities, available-for-sale [Abstract] |  |  |  |  |
Amortized cost |  |  |  |  | 10,623
Unrealized gains |  |  |  |  | 3,672
Unrealized losses |  |  |  |  | 146
Estimated fair value |  |  |  |  | 14,149
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months |  |  |  |  | 0
12 months or longer |  |  |  |  | 2,959
Total |  |  |  |  | 2,959
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months |  |  |  |  | 0
12 months or longer |  |  |  |  | (146)
Total |  |  |  |  | $ (146)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |  |
Less than 12 months | Position |  |  |  |  | 0
12 months or longer | Position |  |  |  |  | 1
Total | Position |  |  |  |  | 1

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