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Securities, Available for Sale (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
Position
Dec. 31, 2015
USD ($)
Position
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 1,269,713 $ 1,169,337
Unrealized gains 20,616 9,878
Unrealized losses (1,430) (4,671)
Estimated fair value 1,288,899 1,174,544
Amortized costs of securities available for sale pledged to secure public deposits 1,600,000 1,400,000
Amortized costs of securities available for sale pledged as collateral for repurchase agreements 223,800 205,900
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 73,871 624,819
12 Months or Longer, Fair Value 6,230 29,822
Total, Fair Value 80,101 654,641
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses (295) (4,283)
12 Months or Longer, Unrealized Losses (1,135) (388)
Total Unrealized Losses $ (1,430) $ (4,671)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 22 79
12 Months or Longer, Number of Positions | Position 7 12
Total, Number of Positions | Position 29 91
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Within one year $ 39,403  
From one to five years 245,571  
From five to ten years 153,633  
After ten years 814,362  
Total, Amortized Cost 1,252,969  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Within one year 39,495  
From one to five years 247,544  
From five to ten years 156,600  
After ten years 824,942  
Total, Fair Value 1,268,581  
Federal Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 255,115 $ 312,580
Unrealized gains 1,006 203
Unrealized losses (28) (1,511)
Estimated fair value 256,093 311,272
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 9,955 186,685
12 Months or Longer, Fair Value 0 19,801
Total, Fair Value 9,955 206,486
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses (28) (1,312)
12 Months or Longer, Unrealized Losses 0 (199)
Total Unrealized Losses $ (28) $ (1,511)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 1 15
12 Months or Longer, Number of Positions | Position 0 2
Total, Number of Positions | Position 1 17
State & Municipal [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 38,327 $ 31,208
Unrealized gains 357 446
Unrealized losses (30) (17)
Estimated fair value 38,654 31,637
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 7,659 4,599
12 Months or Longer, Fair Value 488 502
Total, Fair Value 8,147 5,101
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses (28) (14)
12 Months or Longer, Unrealized Losses (2) (3)
Total Unrealized Losses $ (30) $ (17)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 12 7
12 Months or Longer, Number of Positions | Position 1 1
Total, Number of Positions | Position 13 8
Mortgage-Backed [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value $ 0 $ 177,270
12 Months or Longer, Fair Value 996 1,066
Total, Fair Value 996 178,336
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses 0 (1,068)
12 Months or Longer, Unrealized Losses (13) (14)
Total Unrealized Losses $ (13) $ (1,082)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 0 33
12 Months or Longer, Number of Positions | Position 4 5
Total, Number of Positions | Position 4 38
Mortgage-backed Securities, Issued by US Government-Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 356,484 $ 398,086
Unrealized gains 8,969 4,141
Unrealized losses 0 (1,068)
Estimated fair value 365,453 401,159
Mortgage-backed Securities, Issued by US Government Agency Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 6,418 8,191
Unrealized gains 506 560
Unrealized losses (13) (14)
Estimated fair value 6,911 8,737
Collateralized Mortgage Obligations [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 56,083 256,265
12 Months or Longer, Fair Value 0 5,218
Total, Fair Value 56,083 261,483
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses (213) (1,889)
12 Months or Longer, Unrealized Losses 0 (54)
Total Unrealized Losses $ (213) $ (1,943)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 8 24
12 Months or Longer, Number of Positions | Position 0 2
Total, Number of Positions | Position 8 26
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 536,694 $ 364,936
Unrealized gains 4,580 931
Unrealized losses (189) (1,828)
Estimated fair value 541,085 364,039
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 59,931 40,699
Unrealized gains 478 348
Unrealized losses (24) (115)
Estimated fair value 60,385 40,932
Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 16,744 13,637
Unrealized gains 4,720 3,249
Unrealized losses (1,146) (118)
Estimated fair value 20,318 16,768
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 174 0
12 Months or Longer, Fair Value 4,746 3,235
Total, Fair Value 4,920 3,235
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses (26) 0
12 Months or Longer, Unrealized Losses (1,120) (118)
Total Unrealized Losses $ (1,146) $ (118)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 1 0
12 Months or Longer, Number of Positions | Position 2 2
Total, Number of Positions | Position 3 2