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Allowance for Credit Losses and Allowance for Unfunded Commitments and Letters of Credit (Analysis of Credit Quality of the Loan Portfolio) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year $ 1,273,914   $ 2,745,438      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,545,147   1,490,732      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,367,921   1,201,138      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,086,338   854,212      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 745,604   798,466      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 2,154,352   1,751,150      
Financing Receivable, Revolving 2,135,148   1,748,587      
Financing Receivable, Revolving Converted to Term Loans 13,963   52,214      
Loans and Leases Receivable, Net of Deferred Income 11,322,387   10,641,937      
Financing Receivable, Allowance for Credit Loss 149,935 $ 146,949 155,578 $ 142,988 $ 148,294 $ 149,140
Loans, net 11,172,452   10,486,359      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 705,896   1,074,864      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,037,648   766,442      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 719,894   715,378      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 682,472   507,656      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 456,528   545,313      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,587,204   1,289,984      
Financing Receivable, Revolving 55,098   75,783      
Financing Receivable, Revolving Converted to Term Loans 6,360   5,843      
Loans and Leases Receivable, Net of Deferred Income 5,251,100   4,981,263      
Financing Receivable, Allowance for Credit Loss 57,119 57,307 61,254 53,250 57,050 68,934
Commercial Real Estate [Member] | Pass [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 705,896   1,068,493      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,033,579   760,545      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 709,061   650,593      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 629,353   492,348      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 450,830   515,233      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,490,341   1,180,115      
Financing Receivable, Revolving 54,099   74,754      
Financing Receivable, Revolving Converted to Term Loans 6,325   3,644      
Loans and Leases Receivable, Net of Deferred Income 5,079,484   4,745,725      
Commercial Real Estate [Member] | Special Mention [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 0   2,252      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,882   0      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,373   19,016      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 30,655   6,196      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 1,424   163      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 26,442   27,270      
Financing Receivable, Revolving 0   0      
Financing Receivable, Revolving Converted to Term Loans 0   2,199      
Loans and Leases Receivable, Net of Deferred Income 61,776   57,096      
Commercial Real Estate [Member] | Substandard [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 0   4,119      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,187   5,897      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 9,460   45,769      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 22,464   9,112      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 4,274   29,917      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 70,421   82,599      
Financing Receivable, Revolving 999   1,029      
Financing Receivable, Revolving Converted to Term Loans 35   0      
Loans and Leases Receivable, Net of Deferred Income 109,840   178,442      
Commercial Business [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 305,290   896,907      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 751,732   430,749      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 392,591   305,313      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 265,306   246,418      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 215,595   165,036      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 337,085   259,869      
Financing Receivable, Revolving 1,373,111   1,081,668      
Financing Receivable, Revolving Converted to Term Loans 6,246   37,308      
Loans and Leases Receivable, Net of Deferred Income 3,646,956   3,423,268      
Financing Receivable, Allowance for Credit Loss 51,985 50,474 54,712 57,554 58,405 45,250
Commercial Business [Member] | Pass [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 305,290   891,957      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 742,045   426,004      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 386,970   280,823      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 239,935   217,605      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 191,713   144,363      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 306,756   232,356      
Financing Receivable, Revolving 1,313,072   1,028,616      
Financing Receivable, Revolving Converted to Term Loans 5,325   35,411      
Loans and Leases Receivable, Net of Deferred Income 3,491,106   3,257,135      
Commercial Business [Member] | Special Mention [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 0   621      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 5,434   135      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,924   6,097      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 6,877   747      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 311   105      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 205   51      
Financing Receivable, Revolving 22,562   34,256      
Financing Receivable, Revolving Converted to Term Loans 206   236      
Loans and Leases Receivable, Net of Deferred Income 37,519   42,248      
Commercial Business [Member] | Substandard [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 0   4,329      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 4,253   4,610      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 3,697   18,393      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 18,494   28,066      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 23,571   20,568      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 30,124   27,462      
Financing Receivable, Revolving 37,477   18,796      
Financing Receivable, Revolving Converted to Term Loans 715   1,661      
Loans and Leases Receivable, Net of Deferred Income 118,331   123,885      
Agriculture [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 63,852   147,723      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 135,742   95,681      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 84,393   84,251      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 76,579   31,355      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 26,091   51,590      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 111,707   81,526      
Financing Receivable, Revolving 354,069   296,263      
Financing Receivable, Revolving Converted to Term Loans 666   7,326      
Loans and Leases Receivable, Net of Deferred Income 853,099   795,715      
Financing Receivable, Allowance for Credit Loss 8,895 8,010 8,148 7,920 9,487 9,052
Agriculture [Member] | Pass [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 63,852   147,561      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 134,066   87,964      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 77,772   74,658      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 75,835   29,739      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 24,957   46,058      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 108,954   79,693      
Financing Receivable, Revolving 325,438   266,573      
Financing Receivable, Revolving Converted to Term Loans 666   5,448      
Loans and Leases Receivable, Net of Deferred Income 811,540   737,694      
Agriculture [Member] | Special Mention [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 0   162      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 152   0      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0   445      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 196   0      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0   0      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0   0      
Financing Receivable, Revolving 618   565      
Financing Receivable, Revolving Converted to Term Loans 0   0      
Loans and Leases Receivable, Net of Deferred Income 966   1,172      
Agriculture [Member] | Substandard [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 0   0      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,524   7,717      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 6,621   9,148      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 548   1,616      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 1,134   5,532      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 2,753   1,833      
Financing Receivable, Revolving 28,013   29,125      
Financing Receivable, Revolving Converted to Term Loans 0   1,878      
Loans and Leases Receivable, Net of Deferred Income 40,593   56,849      
Construction [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 106,490   228,661      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 247,132   53,880      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 40,102   37,543      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 15,874   3,183      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 3,155   3,285      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 4,900   2,438      
Financing Receivable, Revolving 64,558   55,765      
Financing Receivable, Revolving Converted to Term Loans 0   0      
Loans and Leases Receivable, Net of Deferred Income 482,211   384,755      
Financing Receivable, Allowance for Credit Loss 5,914 5,399 5,397 6,559 6,551 7,636
Construction [Member] | Pass [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 106,490   228,661      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 246,371   53,880      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 40,102   35,795      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 14,137   3,183      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 2,702   3,285      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 4,849   2,189      
Financing Receivable, Revolving 64,558   55,765      
Financing Receivable, Revolving Converted to Term Loans 0   0      
Loans and Leases Receivable, Net of Deferred Income 479,209   382,758      
Construction [Member] | Special Mention [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 0          
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 761          
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0          
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0          
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 453          
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0          
Financing Receivable, Revolving 0          
Financing Receivable, Revolving Converted to Term Loans 0          
Loans and Leases Receivable, Net of Deferred Income 1,214          
Construction [Member] | Substandard [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 0   0      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0   0      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0   1,748      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,737   0      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0   0      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 51   249      
Financing Receivable, Revolving 0   0      
Financing Receivable, Revolving Converted to Term Loans 0   0      
Loans and Leases Receivable, Net of Deferred Income 1,788   1,997      
One-to-Four Family Residential [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 88,455   390,238      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 369,197   141,269      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 129,007   56,703      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 44,689   52,111      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 42,336   32,681      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 103,363   116,043      
Financing Receivable, Revolving 264,457   223,232      
Financing Receivable, Revolving Converted to Term Loans 686   1,631      
Loans and Leases Receivable, Net of Deferred Income 1,042,190   1,013,908      
Financing Receivable, Allowance for Credit Loss 24,626 24,356 24,123 16,519 15,638 16,875
One-to-Four Family Residential [Member] | Pass [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 88,455   390,153      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 368,446   140,799      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 128,930   56,520      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 44,689   51,549      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 41,821   32,447      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 102,116   111,307      
Financing Receivable, Revolving 264,454   222,747      
Financing Receivable, Revolving Converted to Term Loans 429   1,347      
Loans and Leases Receivable, Net of Deferred Income 1,039,340   1,006,869      
One-to-Four Family Residential [Member] | Substandard [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 0   85      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 751   470      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 77   183      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0   562      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 515   234      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,247   4,736      
Financing Receivable, Revolving 3   485      
Financing Receivable, Revolving Converted to Term Loans 257   284      
Loans and Leases Receivable, Net of Deferred Income 2,850   7,039      
Consumer Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 3,931   7,045      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 3,696   2,711      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,934   1,950      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,418   13,489      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 1,899   561      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 10,093   1,290      
Financing Receivable, Revolving 23,855   15,876      
Financing Receivable, Revolving Converted to Term Loans 5   106      
Loans and Leases Receivable, Net of Deferred Income 46,831   43,028      
Financing Receivable, Allowance for Credit Loss 1,396 $ 1,403 1,944 $ 1,186 $ 1,163 $ 1,393
Consumer Loan [Member] | Pass [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 3,931   7,045      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 3,671   2,711      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,934   1,950      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,415   13,489      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 1,899   560      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 10,082   1,277      
Financing Receivable, Revolving 23,855   15,853      
Financing Receivable, Revolving Converted to Term Loans 5   97      
Loans and Leases Receivable, Net of Deferred Income 46,792   42,982      
Consumer Loan [Member] | Substandard [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 0   0      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 25   0      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0   0      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 3   0      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0   1      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 11   13      
Financing Receivable, Revolving 0   23      
Financing Receivable, Revolving Converted to Term Loans 0   9      
Loans and Leases Receivable, Net of Deferred Income $ 39   $ 46