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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
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year $ 2,784,244   $ 2,223,383      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,228,188   1,379,336      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,007,625   985,423      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 706,282   875,545      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 630,252   812,034      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,359,472   1,413,553      
Financing Receivable, Revolving 1,770,553   1,687,345      
Financing Receivable, Revolving Converted to Term Loans 34,769   51,041      
Loans and Leases Receivable, Net of Deferred Income 9,521,385   9,427,660      
Financing Receivable, Allowance for Credit Loss 142,785 $ 142,988 149,140 $ 156,968 $ 151,546 $ 83,968
Loans, net 9,378,600   9,278,520      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 1,281,555   680,708      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 503,008   709,562      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 537,755   513,737      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 375,154   547,996      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 394,638   498,904      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 929,754   1,038,233      
Financing Receivable, Revolving 60,158   55,443      
Financing Receivable, Revolving Converted to Term Loans 6,462   17,730      
Loans and Leases Receivable, Net of Deferred Income 4,088,484   4,062,313      
Financing Receivable, Allowance for Credit Loss 51,752 53,250 68,934 61,324 50,233 20,340
Commercial Real Estate [Member] | Pass [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 1,250,051   674,444      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 490,402   645,328      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 460,118   478,881      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 359,635   502,112      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 342,653   408,972      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 823,529   946,980      
Financing Receivable, Revolving 58,180   52,049      
Financing Receivable, Revolving Converted to Term Loans 4,263   11,332      
Loans and Leases Receivable, Net of Deferred Income 3,788,831   3,720,098      
Commercial Real Estate [Member] | Special Mention [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 21,356   3,348      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 10,947   39,374      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 24,415   21,285      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 9,575   30,232      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 26,238   46,197      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 29,400   50,115      
Financing Receivable, Revolving 0   5      
Financing Receivable, Revolving Converted to Term Loans 2,199   2,139      
Loans and Leases Receivable, Net of Deferred Income 124,130   192,695      
Commercial Real Estate [Member] | Substandard [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 10,148   2,916      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,659   24,860      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 53,222   13,571      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 5,944   15,652      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 25,747   43,735      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 76,825   41,138      
Financing Receivable, Revolving 1,978   3,389      
Financing Receivable, Revolving Converted to Term Loans 0   4,259      
Loans and Leases Receivable, Net of Deferred Income 175,523   149,520      
Commercial Business [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 870,296   1,094,027      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 422,283   400,172      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 308,426   343,892      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 253,106   229,497      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 161,351   231,713      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 288,740   229,070      
Financing Receivable, Revolving 1,109,231   1,055,285      
Financing Receivable, Revolving Converted to Term Loans 22,918   14,312      
Loans and Leases Receivable, Net of Deferred Income 3,436,351   3,597,968      
Financing Receivable, Allowance for Credit Loss 55,561 57,554 45,250 50,572 53,186 30,292
Commercial Business [Member] | Pass [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 864,775   1,087,400      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 418,353   366,435      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 279,874   324,360      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 224,100   199,010      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 140,381   218,313      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 260,224   214,677      
Financing Receivable, Revolving 1,033,171   1,000,725      
Financing Receivable, Revolving Converted to Term Loans 21,028   11,540      
Loans and Leases Receivable, Net of Deferred Income 3,241,906   3,422,460      
Commercial Business [Member] | Special Mention [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 109   3,002      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 19   26,361      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 6,223   8,471      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,487   24,582      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 145   7,004      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 127   10,650      
Financing Receivable, Revolving 59,678   22,426      
Financing Receivable, Revolving Converted to Term Loans 244   0      
Loans and Leases Receivable, Net of Deferred Income 68,032   102,496      
Commercial Business [Member] | Substandard [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 5,412   3,625      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 3,911   7,376      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 22,329   11,061      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 27,519   5,905      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 20,825   6,396      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 28,389   3,743      
Financing Receivable, Revolving 16,382   32,134      
Financing Receivable, Revolving Converted to Term Loans 1,646   2,772      
Loans and Leases Receivable, Net of Deferred Income 126,413   73,012      
Agriculture [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 160,394   147,356      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 87,144   103,182      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 81,576   50,587      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 33,175   62,657      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 53,047   59,177      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 79,601   62,898      
Financing Receivable, Revolving 318,668   283,000      
Financing Receivable, Revolving Converted to Term Loans 2,380   10,770      
Loans and Leases Receivable, Net of Deferred Income 815,985   779,627      
Financing Receivable, Allowance for Credit Loss 8,965 7,920 9,052 12,461 14,868 15,835
Agriculture [Member] | Pass [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 150,807   142,163      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 78,668   90,612      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 73,200   44,434      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 31,159   58,366      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 48,274   58,893      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 78,461   59,396      
Financing Receivable, Revolving 283,932   244,135      
Financing Receivable, Revolving Converted to Term Loans 1,770   9,299      
Loans and Leases Receivable, Net of Deferred Income 746,271   707,298      
Agriculture [Member] | Special Mention [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 3,158   0      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,078   90      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 700   285      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 186   33      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 64   0      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0   0      
Financing Receivable, Revolving 3,913   85      
Financing Receivable, Revolving Converted to Term Loans 0   13      
Loans and Leases Receivable, Net of Deferred Income 9,099   506      
Agriculture [Member] | Substandard [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 6,429   5,193      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 7,398   12,480      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 7,676   5,868      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,830   4,258      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 4,709   284      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,140   3,502      
Financing Receivable, Revolving 30,823   38,780      
Financing Receivable, Revolving Converted to Term Loans 610   1,458      
Loans and Leases Receivable, Net of Deferred Income 60,615   71,823      
Construction [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 174,463   134,693      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 80,720   84,706      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 28,790   10,066      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 3,238   3,498      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 2,110   763      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 4,623   1,861      
Financing Receivable, Revolving 32,315   29,323      
Financing Receivable, Revolving Converted to Term Loans 310   3,753      
Loans and Leases Receivable, Net of Deferred Income 326,569   268,663      
Financing Receivable, Allowance for Credit Loss 6,367 6,559 7,636 8,963 7,953 8,571
Construction [Member] | Pass [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 174,463   134,693      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 80,720   66,974      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 8,279   10,066      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 3,238   3,498      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 2,110   763      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 4,569   1,805      
Financing Receivable, Revolving 32,315   29,323      
Financing Receivable, Revolving Converted to Term Loans 310   3,753      
Loans and Leases Receivable, Net of Deferred Income 306,004   250,875      
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   17,732      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 20,511   0      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0   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 54   56      
Financing Receivable, Revolving 0   0      
Financing Receivable, Revolving Converted to Term Loans 0   0      
Loans and Leases Receivable, Net of Deferred Income 20,565   17,788      
One-to-Four Family Residential [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 292,053   161,021      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 132,177   78,605      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 49,183   63,255      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 40,142   30,903      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 18,523   21,233      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 55,805   80,261      
Financing Receivable, Revolving 234,496   244,330      
Financing Receivable, Revolving Converted to Term Loans 1,498   3,962      
Loans and Leases Receivable, Net of Deferred Income 823,877   683,570      
Financing Receivable, Allowance for Credit Loss 18,855 16,519 16,875 22,107 23,711 7,435
One-to-Four Family Residential [Member] | Pass [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 290,818   161,021      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 131,779   77,756      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 48,990   62,696      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 40,142   29,737      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 18,438   20,889      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 55,278   78,098      
Financing Receivable, Revolving 234,434   243,325      
Financing Receivable, Revolving Converted to Term Loans 1,426   3,655      
Loans and Leases Receivable, Net of Deferred Income 821,305   677,177      
One-to-Four Family Residential [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     0      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year     332      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year     0      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year     0      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year     195      
Financing Receivable, Revolving     0      
Financing Receivable, Revolving Converted to Term Loans     0      
Loans and Leases Receivable, Net of Deferred Income     527      
One-to-Four Family Residential [Member] | Substandard [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 1,235   0      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 398   849      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 193   227      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0   1,166      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 85   344      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 527   1,968      
Financing Receivable, Revolving 62   1,005      
Financing Receivable, Revolving Converted to Term Loans 72   307      
Loans and Leases Receivable, Net of Deferred Income 2,572   5,866      
Consumer Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 5,483   5,578      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,856   3,109      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,895   3,886      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,467   994      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 583   244      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 949   1,230      
Financing Receivable, Revolving 15,685   19,964      
Financing Receivable, Revolving Converted to Term Loans 1,201   514      
Loans and Leases Receivable, Net of Deferred Income 30,119   35,519      
Financing Receivable, Allowance for Credit Loss 1,285 $ 1,186 1,393 $ 1,541 $ 1,595 $ 883
Consumer Loan [Member] | Pass [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 5,483   5,548      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,841   3,109      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,895   3,886      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,467   989      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 582   244      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 947   1,060      
Financing Receivable, Revolving 15,662   19,911      
Financing Receivable, Revolving Converted to Term Loans 1,201   474      
Loans and Leases Receivable, Net of Deferred Income 30,078   35,221      
Consumer Loan [Member] | Substandard [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Year One, Originated, Current Fiscal Year 0   30      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 15   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 0   5      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 1   0      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 2   170      
Financing Receivable, Revolving 23   53      
Financing Receivable, Revolving Converted to Term Loans 0   40      
Loans and Leases Receivable, Net of Deferred Income $ 41   $ 298