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Securities, Held to Maturity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost $ 929,541   $ 929,541   $ 733,210
Unrealized gains 7   7   10,040
Unrealized losses 115,448   115,448   7,990
Estimated fair value 814,100   814,100   735,260
Allowance for credit losses on HTM securities 0   0   0
Transactions of HTM securities [Abstract]          
Gains from calls on HTM securities 0 $ 14 4 $ 29  
Asset Pledged as Collateral [Member] | Public Deposits or Other Purposes [Member]          
Securities pledged [Abstract]          
AFS and HTM securities 1,740,000   1,740,000   1,630,000
Asset Pledged as Collateral [Member] | Securities Sold under Repurchase Agreements [Member]          
Securities pledged [Abstract]          
AFS and HTM securities 126,200   126,200   162,100
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 21,179   21,179   4,365
Estimated fair value 78,821   78,821   95,635
Mortgage-Backed, Government Sponsored Enterprises [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 254,889   254,889   161,462
Unrealized gains 0   0   2,232
Unrealized losses 40,946   40,946   1,319
Estimated fair value 213,943   213,943   162,375
Mortgage-Backed, U.S. Government Agency Securities [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 18,403   18,403   9,112
Unrealized gains 4   4   514
Unrealized losses 573   573   0
Estimated fair value 17,834   17,834   9,626
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 203,213   203,213   94,342
Unrealized gains 0   0   1,932
Unrealized losses 14,608   14,608   129
Estimated fair value 188,605   188,605   96,145
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 67,940   67,940   44,473
Unrealized gains 1   1   336
Unrealized losses 9,071   9,071   674
Estimated fair value 58,870   58,870   44,135
State & Municipal [Member]          
Held-to-maturity securities, fair value to amortized cost [Abstract]          
Amortized cost 285,096   285,096   323,821
Unrealized gains 2   2   5,026
Unrealized losses 29,071   29,071   1,503
Estimated fair value $ 256,027   $ 256,027   $ 327,344