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Securities, Held to Maturity (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Position
Dec. 31, 2017
USD ($)
Position
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost $ 544,163 $ 484,073
Unrealized gains 401 1,805
Unrealized losses 11,585 4,007
Estimated fair value 532,979 481,871
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months 280,192 156,340
12 months or longer 79,783 87,037
Total 359,975 243,377
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (6,689) (1,336)
12 months or longer (4,896) (2,671)
Total $ (11,585) $ (4,007)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 138 59
12 months or longer | Position 33 32
Total | Position 171 91
Amortized costs of securities available for sale and held to maturity pledged to secure public deposits $ 1,600,000 $ 1,500,000
Amortized costs of securities AFS and HTM pledged as collateral for repurchase agreements 226,200 256,200
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]    
Within one year 51,786  
From one to five years 50,159  
From five to ten years 201,007  
After ten years 241,211  
Amortized cost 544,163 484,073
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]    
Within one year 51,786  
From one to five years 50,281  
From five to ten years 196,191  
After ten years 234,721  
Fair value 532,979 481,871
Mortgage-Backed [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months 56,920 15,477
12 months or longer 30,532 33,703
Total 87,452 49,180
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (1,686) (140)
12 months or longer (1,558) (670)
Total $ (3,244) $ (810)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 4 2
12 months or longer | Position 2 2
Total | Position 6 4
Mortgage-Backed, Government Sponsored Enterprises [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost $ 90,696 $ 96,357
Unrealized gains 0 85
Unrealized losses 3,244 810
Estimated fair value 87,452 95,632
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]    
Amortized cost 90,696 96,357
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]    
Fair value 87,452 95,632
Mortgage-Backed, U.S. Government Agency Securities [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 376 418
Unrealized gains 43 57
Unrealized losses 0 0
Estimated fair value 419 475
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]    
Amortized cost 376 418
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]    
Fair value 419 475
Collateralized Mortgage Obligations [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months 149,776 118,476
12 months or longer 33,586 37,614
Total 183,362 156,090
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (3,693) (1,064)
12 months or longer (2,296) (1,513)
Total $ (5,989) $ (2,577)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 24 17
12 months or longer | Position 6 6
Total | Position 30 23
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost $ 229,353 $ 186,327
Unrealized gains 92 224
Unrealized losses 5,989 2,577
Estimated fair value 223,456 183,974
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]    
Amortized cost 229,353 186,327
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]    
Fair value 223,456 183,974
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 9,788  
Unrealized gains 1  
Unrealized losses 0  
Estimated fair value 9,789  
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]    
Amortized cost 9,788  
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]    
Fair value 9,789  
State & Municipal [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 213,950 200,971
Unrealized gains 265 1,439
Unrealized losses 2,352 620
Estimated fair value 211,863 201,790
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months 73,496 22,387
12 months or longer 15,665 15,720
Total 89,161 38,107
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (1,310) (132)
12 months or longer (1,042) (488)
Total $ (2,352) $ (620)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 110 40
12 months or longer | Position 25 24
Total | Position 135 64
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]    
Amortized cost $ 213,950 $ 200,971
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]    
Fair value $ 211,863 $ 201,790