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Securities, Held to Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost $ 744,601 $ 783,599
Unrealized gains 11,493 3,362
Unrealized losses 1,099 8,286
Estimated fair value 754,995 778,675
Amortized costs of securities available for sale and held to maturity pledged to secure public deposits 1,400,000 1,500,000
Amortized costs of securities AFS and HTM pledged as collateral for repurchase agreements 197,400 215,300
Federal Agency [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 19,996 19,995
Unrealized gains 46 52
Unrealized losses 0 0
Estimated fair value 20,042 20,047
Mortgage-Backed, Government Sponsored Enterprises [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 163,049 164,618
Unrealized gains 2,334 712
Unrealized losses 484 2,773
Estimated fair value 164,899 162,557
Mortgage-Backed, U.S. Government Agency Securities [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 14,530 15,230
Unrealized gains 921 403
Unrealized losses 0 0
Estimated fair value 15,451 15,633
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 232,825 257,475
Unrealized gains 2,712 1,097
Unrealized losses 539 3,897
Estimated fair value 234,998 254,675
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 103,457 83,148
Unrealized gains 3,303 767
Unrealized losses 0 0
Estimated fair value 106,760 83,915
State & Municipal [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 210,744 243,133
Unrealized gains 2,177 331
Unrealized losses 76 1,616
Estimated fair value $ 212,845 $ 241,848