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Securities, Held to Maturity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost $ 622,351   $ 622,351   $ 616,560
Unrealized gains 14,822   14,822   21,942
Unrealized losses 4,219   4,219   1,675
Estimated fair value 632,954   632,954   636,827
Allowance for credit losses on HTM securities 0   0   0
Gains from calls on HTM securities 0 $ 4 15 $ 4  
Amortized costs of securities available for sale and held to maturity pledged 1,600,000   1,600,000   1,400,000
Amortized costs of securities AFS and HTM pledged as collateral for repurchase agreements 164,500   164,500   305,200
Federal Agency [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 100,000   100,000   100,000
Unrealized gains 0   0   0
Unrealized losses 3,293   3,293   1,658
Estimated fair value 96,707   96,707   98,342
Mortgage-Backed, Government Sponsored Enterprises [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 114,278   114,278   107,914
Unrealized gains 3,003   3,003   4,583
Unrealized losses 38   38   0
Estimated fair value 117,243   117,243   112,497
Mortgage-Backed, U.S. Government Agency Securities [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 10,299   10,299   11,533
Unrealized gains 821   821   979
Unrealized losses 0   0   0
Estimated fair value 11,120   11,120   12,512
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 83,300   83,300   103,105
Unrealized gains 3,664   3,664   4,477
Unrealized losses 0   0   0
Estimated fair value 86,964   86,964   107,582
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 39,472   39,472   79,145
Unrealized gains 1,163   1,163   3,950
Unrealized losses 0   0   0
Estimated fair value 40,635   40,635   83,095
State & Municipal [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 275,002   275,002   214,863
Unrealized gains 6,171   6,171   7,953
Unrealized losses 888   888   17
Estimated fair value $ 280,285   $ 280,285   $ 222,799