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Securities, Available for Sale (Details)
$ in Thousands
Mar. 31, 2016
USD ($)
Position
Dec. 31, 2015
USD ($)
Position
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 1,241,485 $ 1,169,337
Unrealized gains 19,222 9,878
Unrealized losses (833) (4,671)
Estimated fair value 1,259,874 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 198,300 205,900
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 66,607 624,819
12 Months or Longer, Fair Value 31,880 29,822
Total, Fair Value 98,487 654,641
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months Unrealized Losses (115) (4,283)
12 months or longer Unrealized Losses (718) (388)
Total Unrealized Losses $ (833) $ (4,671)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 15 79
12 Months or Longer, Number of Positions | Position 14 12
Total, Number of Positions | Position 29 91
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Within one year $ 33,121  
From one to five years 295,127  
From five to ten years 158,231  
After ten years 738,332  
Total, Amortized Cost 1,224,811  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Within one year 33,253  
From one to five years 297,004  
From five to ten years 162,243  
After ten years 747,653  
Total, Fair Value 1,240,153  
Federal Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 275,258 $ 312,580
Unrealized gains 1,070 203
Unrealized losses (26) (1,511)
Estimated fair value 276,302 311,272
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 34,920 186,685
12 Months or Longer, Fair Value 9,996 19,801
Total, Fair Value 44,916 206,486
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months Unrealized Losses (22) (1,312)
12 months or longer Unrealized Losses (4) (199)
Total Unrealized Losses $ (26) $ (1,511)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 3 15
12 Months or Longer, Number of Positions | Position 1 2
Total, Number of Positions | Position 4 17
State & Municipal [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 39,909 $ 31,208
Unrealized gains 490 446
Unrealized losses (23) (17)
Estimated fair value 40,376 31,637
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 3,450 4,599
12 Months or Longer, Fair Value 498 502
Total, Fair Value 3,948 5,101
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months Unrealized Losses (21) (14)
12 months or longer Unrealized Losses (2) (3)
Total Unrealized Losses $ (23) $ (17)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 5 7
12 Months or Longer, Number of Positions | Position 1 1
Total, Number of Positions | Position 6 8
Mortgage-Backed [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value $ 978 $ 177,270
12 Months or Longer, Fair Value 10,146 1,066
Total, Fair Value 11,124 178,336
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months Unrealized Losses (1) (1,068)
12 months or longer Unrealized Losses (38) (14)
Total Unrealized Losses $ (39) $ (1,082)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 3 33
12 Months or Longer, Number of Positions | Position 6 5
Total, Number of Positions | Position 9 38
Mortgage-backed Securities, Issued by US Government-Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 401,525 $ 398,086
Unrealized gains 8,279 4,141
Unrealized losses (25) (1,068)
Estimated fair value 409,779 401,159
Mortgage-backed Securities, Issued by US Government Agency Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 7,484 8,191
Unrealized gains 551 560
Unrealized losses (14) (14)
Estimated fair value 8,021 8,737
Collateralized Mortgage Obligations [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 27,259 256,265
12 Months or Longer, Fair Value 5,785 5,218
Total, Fair Value 33,044 261,483
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months Unrealized Losses (71) (1,889)
12 months or longer Unrealized Losses (13) (54)
Total Unrealized Losses $ (84) $ (1,943)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 4 24
12 Months or Longer, Number of Positions | Position 3 2
Total, Number of Positions | Position 7 26
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 446,887 $ 364,936
Unrealized gains 4,479 931
Unrealized losses (67) (1,828)
Estimated fair value 451,299 364,039
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 53,748 40,699
Unrealized gains 645 348
Unrealized losses (17) (115)
Estimated fair value 54,376 40,932
Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 16,674 13,637
Unrealized gains 3,708 3,249
Unrealized losses (661) (118)
Estimated fair value 19,721 16,768
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 0 0
12 Months or Longer, Fair Value 5,455 3,235
Total, Fair Value 5,455 3,235
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months Unrealized Losses 0 0
12 months or longer Unrealized Losses (661) (118)
Total Unrealized Losses $ (661) $ (118)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 0 0
12 Months or Longer, Number of Positions | Position 3 2
Total, Number of Positions | Position 3 2