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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
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Year One, Originated, Current Fiscal Year $ 469,814 $ 2,745,438    
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,625,810 1,490,732    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,432,837 1,201,138    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,149,171 854,212    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 806,213 798,466    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 2,360,668 1,751,150    
Financing Receivable, Revolving 1,906,967 1,748,587    
Financing Receivable, Revolving Converted to Term Loans 8,204 52,214    
Loans and Leases Receivable, Net of Deferred Income 10,759,684 10,641,937    
Financing Receivable, Allowance for Credit Loss 146,949 155,578 $ 148,294 $ 149,140
Loans, net 10,612,735 10,486,359    
Commercial Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Year One, Originated, Current Fiscal Year 237,545 1,074,864    
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,054,555 766,442    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 750,332 715,378    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 715,004 507,656    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 498,423 545,313    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,727,244 1,289,984    
Financing Receivable, Revolving 60,751 75,783    
Financing Receivable, Revolving Converted to Term Loans 3,618 5,843    
Loans and Leases Receivable, Net of Deferred Income 5,047,472 4,981,263    
Financing Receivable, Allowance for Credit Loss 57,307 61,254 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 237,545 1,068,493    
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,053,628 760,545    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 746,400 650,593    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 669,287 492,348    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 492,695 515,233    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,605,407 1,180,115    
Financing Receivable, Revolving 59,752 74,754    
Financing Receivable, Revolving Converted to Term Loans 3,618 3,644    
Loans and Leases Receivable, Net of Deferred Income 4,868,332 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 0 0    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,381 19,016    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 16,450 6,196    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0 163    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 26,154 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 43,985 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 927 5,897    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 2,551 45,769    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 29,267 9,112    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 5,728 29,917    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 95,683 82,599    
Financing Receivable, Revolving 999 1,029    
Financing Receivable, Revolving Converted to Term Loans 0 0    
Loans and Leases Receivable, Net of Deferred Income 135,155 178,442    
Commercial Business [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Year One, Originated, Current Fiscal Year 129,275 896,907    
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 799,096 430,749    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 413,180 305,313    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 287,245 246,418    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 228,982 165,036    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 382,476 259,869    
Financing Receivable, Revolving 1,248,163 1,081,668    
Financing Receivable, Revolving Converted to Term Loans 3,890 37,308    
Loans and Leases Receivable, Net of Deferred Income 3,492,307 3,423,268    
Financing Receivable, Allowance for Credit Loss 50,474 54,712 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 129,275 891,957    
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 794,588 426,004    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 408,780 280,823    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 262,133 217,605    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 203,962 144,363    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 351,159 232,356    
Financing Receivable, Revolving 1,198,963 1,028,616    
Financing Receivable, Revolving Converted to Term Loans 3,410 35,411    
Loans and Leases Receivable, Net of Deferred Income 3,352,270 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 677 135    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 355 6,097    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 6,485 747    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 372 105    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0 51    
Financing Receivable, Revolving 16,898 34,256    
Financing Receivable, Revolving Converted to Term Loans 330 236    
Loans and Leases Receivable, Net of Deferred Income 25,117 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 3,831 4,610    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 4,045 18,393    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 18,627 28,066    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 24,648 20,568    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 31,317 27,462    
Financing Receivable, Revolving 32,302 18,796    
Financing Receivable, Revolving Converted to Term Loans 150 1,661    
Loans and Leases Receivable, Net of Deferred Income 114,920 123,885    
Agriculture [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Year One, Originated, Current Fiscal Year 26,826 147,723    
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 142,836 95,681    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 89,016 84,251    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 79,704 31,355    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 27,961 51,590    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 124,273 81,526    
Financing Receivable, Revolving 274,477 296,263    
Financing Receivable, Revolving Converted to Term Loans 226 7,326    
Loans and Leases Receivable, Net of Deferred Income 765,319 795,715    
Financing Receivable, Allowance for Credit Loss 8,010 8,148 9,487 9,052
Agriculture [Member] | Pass [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Year One, Originated, Current Fiscal Year 26,826 147,561    
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 141,085 87,964    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 81,501 74,658    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 76,041 29,739    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 27,547 46,058    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 119,214 79,693    
Financing Receivable, Revolving 246,062 266,573    
Financing Receivable, Revolving Converted to Term Loans 226 5,448    
Loans and Leases Receivable, Net of Deferred Income 718,502 737,694    
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 154 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 428 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 665 565    
Financing Receivable, Revolving Converted to Term Loans 0 0    
Loans and Leases Receivable, Net of Deferred Income 1,247 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 1,597 7,717    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 7,515 9,148    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 3,235 1,616    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 414 5,532    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 5,059 1,833    
Financing Receivable, Revolving 27,750 29,125    
Financing Receivable, Revolving Converted to Term Loans 0 1,878    
Loans and Leases Receivable, Net of Deferred Income 45,570 56,849    
Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Year One, Originated, Current Fiscal Year 31,991 228,661    
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 247,354 53,880    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 46,517 37,543    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 16,092 3,183    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 3,169 3,285    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 5,550 2,438    
Financing Receivable, Revolving 58,569 55,765    
Financing Receivable, Revolving Converted to Term Loans 0 0    
Loans and Leases Receivable, Net of Deferred Income 409,242 384,755    
Financing Receivable, Allowance for Credit Loss 5,399 5,397 6,551 7,636
Construction [Member] | Pass [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Year One, Originated, Current Fiscal Year 31,991 228,661    
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 247,354 53,880    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 46,517 35,795    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 14,346 3,183    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 3,169 3,285    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 5,498 2,189    
Financing Receivable, Revolving 58,569 55,765    
Financing Receivable, Revolving Converted to Term Loans 0 0    
Loans and Leases Receivable, Net of Deferred Income 407,444 382,758    
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 1,746 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 52 249    
Financing Receivable, Revolving 0 0    
Financing Receivable, Revolving Converted to Term Loans 0 0    
Loans and Leases Receivable, Net of Deferred Income 1,798 1,997    
One-to-Four Family Residential [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Year One, Originated, Current Fiscal Year 39,826 390,238    
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 377,809 141,269    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 131,600 56,703    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 49,483 52,111    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 45,488 32,681    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 109,603 116,043    
Financing Receivable, Revolving 248,952 223,232    
Financing Receivable, Revolving Converted to Term Loans 396 1,631    
Loans and Leases Receivable, Net of Deferred Income 1,003,157 1,013,908    
Financing Receivable, Allowance for Credit Loss 24,356 24,123 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 39,826 390,153    
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 377,035 140,799    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 131,139 56,520    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 49,382 51,549    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 44,964 32,447    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 108,061 111,307    
Financing Receivable, Revolving 248,949 222,747    
Financing Receivable, Revolving Converted to Term Loans 249 1,347    
Loans and Leases Receivable, Net of Deferred Income 999,605 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 774 470    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 461 183    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 101 562    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 524 234    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,542 4,736    
Financing Receivable, Revolving 3 485    
Financing Receivable, Revolving Converted to Term Loans 147 284    
Loans and Leases Receivable, Net of Deferred Income 3,552 7,039    
Consumer Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Year One, Originated, Current Fiscal Year 4,351 7,045    
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 4,160 2,711    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 2,192 1,950    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,643 13,489    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 2,190 561    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 11,522 1,290    
Financing Receivable, Revolving 16,055 15,876    
Financing Receivable, Revolving Converted to Term Loans 74 106    
Loans and Leases Receivable, Net of Deferred Income 42,187 43,028    
Financing Receivable, Allowance for Credit Loss 1,403 1,944 $ 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 4,351 7,045    
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 4,139 2,711    
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 2,192 1,950    
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,643 13,489    
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 2,190 560    
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 11,509 1,277    
Financing Receivable, Revolving 16,055 15,853    
Financing Receivable, Revolving Converted to Term Loans 73 97    
Loans and Leases Receivable, Net of Deferred Income 42,152 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 21 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 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 13 13    
Financing Receivable, Revolving 0 23    
Financing Receivable, Revolving Converted to Term Loans 1 9    
Loans and Leases Receivable, Net of Deferred Income $ 35 $ 46