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Securities, Held to Maturity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost $ 592,999   $ 616,560
Unrealized gains 15,493   21,942
Unrealized losses 8,316   1,675
Estimated fair value 600,176   636,827
Allowance for credit losses on HTM securities 0   0
Gains from calls on HTM securities 15 $ 0  
Amortized costs of securities available for sale and held to maturity pledged 1,600,000   1,400,000
Amortized costs of securities AFS and HTM pledged as collateral for repurchase agreements 273,200   305,200
Federal Agency [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 100,000   100,000
Unrealized gains 0   0
Unrealized losses 5,841   1,658
Estimated fair value 94,159   98,342
Mortgage-Backed, Government Sponsored Enterprises [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 92,584   107,914
Unrealized gains 3,312   4,583
Unrealized losses 108   0
Estimated fair value 95,788   112,497
Mortgage-Backed, U.S. Government Agency Securities [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 10,309   11,533
Unrealized gains 670   979
Unrealized losses 0   0
Estimated fair value 10,979   12,512
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 92,059   103,105
Unrealized gains 4,078   4,477
Unrealized losses 0   0
Estimated fair value 96,137   107,582
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 53,814   79,145
Unrealized gains 2,124   3,950
Unrealized losses 0   0
Estimated fair value 55,938   83,095
State & Municipal [Member]      
Held-to-maturity securities, fair value to amortized cost [Abstract]      
Amortized cost 244,233   214,863
Unrealized gains 5,309   7,953
Unrealized losses 2,367   17
Estimated fair value $ 247,175   $ 222,799