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Securities, Held to Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost $ 780,565 $ 783,599
Unrealized gains 5,767 3,362
Unrealized losses 3,571 8,286
Estimated fair value 782,761 778,675
Amortized costs of securities available for sale and held to maturity pledged to secure public deposits 1,500,000 1,500,000
Amortized costs of securities AFS and HTM pledged as collateral for repurchase agreements 207,500 215,300
Federal Agency [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 19,995 19,995
Unrealized gains 55 52
Unrealized losses 0 0
Estimated fair value 20,050 20,047
Mortgage-Backed, Government Sponsored Enterprises [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 160,566 164,618
Unrealized gains 1,281 712
Unrealized losses 981 2,773
Estimated fair value 160,866 162,557
Mortgage-Backed, U.S. Government Agency Securities [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 14,545 15,230
Unrealized gains 460 403
Unrealized losses 0 0
Estimated fair value 15,005 15,633
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 247,418 257,475
Unrealized gains 1,388 1,097
Unrealized losses 2,230 3,897
Estimated fair value 246,576 254,675
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 103,741 83,148
Unrealized gains 1,329 767
Unrealized losses 0 0
Estimated fair value 105,070 83,915
State & Municipal [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 234,300 243,133
Unrealized gains 1,254 331
Unrealized losses 360 1,616
Estimated fair value $ 235,194 $ 241,848