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Securities, Available for Sale (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
Position
Dec. 31, 2016
USD ($)
Position
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 1,368,195 $ 1,341,059
Unrealized gains 10,303 11,097
Unrealized losses 10,924 13,866
Estimated fair value 1,367,574 1,338,290
Amortized costs of securities available for sale pledged to secure public deposits 1,600,000 1,500,000
Amortized costs of securities available for sale pledged as collateral for repurchase agreements 244,300 235,600
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months 829,075 902,506
12 months or longer 5,461 5,831
Total 834,536 908,337
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (10,738) (12,347)
12 months or longer (186) (1,519)
Total $ (10,924) $ (13,866)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 150 171
12 months or longer | Position 7 7
Total | Position 157 178
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Within one year $ 43,247  
From one to five years 163,135  
From five to ten years 162,510  
After ten years 985,766  
Amortized cost 1,354,658  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Within one year 43,292  
From one to five years 163,417  
From five to ten years 163,494  
After ten years 978,230  
Fair value 1,348,433  
Federal Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 160,064 $ 175,135
Unrealized gains 80 78
Unrealized losses 563 805
Estimated fair value 159,581 174,408
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months 94,535 119,363
12 months or longer 0 0
Total 94,535 119,363
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (563) (805)
12 months or longer 0 0
Total $ (563) $ (805)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 9 10
12 months or longer | Position 0 0
Total | Position 9 10
State & Municipal [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 47,910 $ 47,053
Unrealized gains 161 153
Unrealized losses 227 480
Estimated fair value 47,844 46,726
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months 24,235 31,873
12 months or longer 1,528 483
Total 25,763 32,356
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (200) (478)
12 months or longer (27) (2)
Total $ (227) $ (480)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 37 55
12 months or longer | Position 2 1
Total | Position 39 56
Mortgage-Backed [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 265,960 $ 277,524
12 months or longer 974 985
Total 266,934 278,509
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (2,307) (2,668)
12 months or longer (13) (13)
Total $ (2,320) $ (2,681)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 46 49
12 months or longer | Position 4 4
Total | Position 50 53
Mortgage-backed Securities, Government Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 559,228 $ 513,814
Unrealized gains 3,156 3,345
Unrealized losses 2,280 2,492
Estimated fair value 560,104 514,667
Mortgage-backed Securities, U.S. Government Agency Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 17,566 14,955
Unrealized gains 397 411
Unrealized losses 40 189
Estimated fair value 17,923 15,177
Collateralized Mortgage Obligations [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months 442,362 473,746
12 months or longer 0 0
Total 442,362 473,746
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (7,651) (8,396)
12 months or longer 0 0
Total $ (7,651) $ (8,396)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 57 57
12 months or longer | Position 0 0
Total | Position 57 57
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 511,651 $ 513,431
Unrealized gains 562 532
Unrealized losses 6,910 7,688
Estimated fair value 505,303 506,275
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 58,239 60,822
Unrealized gains 180 184
Unrealized losses 741 708
Estimated fair value 57,678 60,298
Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 13,537 15,849
Unrealized gains 5,767 6,394
Unrealized losses 163 1,504
Estimated fair value 19,141 20,739
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months 1,983 0
12 months or longer 2,959 4,363
Total 4,942 4,363
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (17) 0
12 months or longer (146) (1,504)
Total $ (163) $ (1,504)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 1 0
12 months or longer | Position 1 2
Total | Position 2 2