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Securities, Held to Maturity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost $ 659,949   $ 659,949   $ 484,073
Unrealized gains 161   161   1,805
Unrealized losses 14,378   14,378   4,007
Estimated fair value 645,732   645,732   481,871
Held-to-maturity securities sold, amortized cost 0 $ 800 0 $ 800  
Held-to-maturity securities sold, unrealized loss 0 $ 2 0 $ 2  
Amortized costs of securities available for sale and held to maturity pledged to secure public deposits 1,600,000   1,600,000   1,500,000
Amortized costs of securities AFS and HTM pledged as collateral for repurchase agreements 196,400   196,400   256,200
Federal Agency [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 9,995   9,995    
Unrealized gains 0   0    
Unrealized losses 46   46    
Estimated fair value 9,949   9,949    
Mortgage-Backed, Government Sponsored Enterprises [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 87,743   87,743   96,357
Unrealized gains 0   0   85
Unrealized losses 4,075   4,075   810
Estimated fair value 83,668   83,668   95,632
Mortgage-Backed, U.S. Government Agency Securities [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 15,241   15,241   418
Unrealized gains 36   36   57
Unrealized losses 69   69   0
Estimated fair value 15,208   15,208   475
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 268,044   268,044   186,327
Unrealized gains 31   31   224
Unrealized losses 7,080   7,080   2,577
Estimated fair value 260,995   260,995   183,974
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 29,401   29,401    
Unrealized gains 4   4    
Unrealized losses 67   67    
Estimated fair value 29,338   29,338    
State & Municipal [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 249,525   249,525   200,971
Unrealized gains 90   90   1,439
Unrealized losses 3,041   3,041   620
Estimated fair value $ 246,574   $ 246,574   $ 201,790