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Securities, Held to Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost $ 621,359 $ 630,074
Unrealized gains 21,085 11,817
Unrealized losses 119 629
Estimated fair value 642,325 641,262
Allowance for credit losses on HTM securities 0  
Amortized costs of securities available for sale and held to maturity pledged 1,400,000 1,300,000
Amortized costs of securities AFS and HTM pledged as collateral for repurchase agreements 270,500 189,800
Mortgage-Backed, Government Sponsored Enterprises [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 151,588 149,448
Unrealized gains 7,020 3,184
Unrealized losses 0 155
Estimated fair value 158,608 152,477
Mortgage-Backed, U.S. Government Agency Securities [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 12,236 13,667
Unrealized gains 815 584
Unrealized losses 0 0
Estimated fair value 13,051 14,251
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 171,397 189,402
Unrealized gains 5,990 2,165
Unrealized losses 0 368
Estimated fair value 177,387 191,199
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 105,704 110,498
Unrealized gains 4,133 3,256
Unrealized losses 0 100
Estimated fair value 109,837 113,654
State & Municipal [Member]    
Held-to-maturity securities, fair value to amortized cost [Abstract]    
Amortized cost 180,434 167,059
Unrealized gains 3,127 2,628
Unrealized losses 119 6
Estimated fair value $ 183,442 $ 169,681