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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Age Analysis of Company's Past Due Loans) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 10,160,684 | $ 10,146,724
Non-accrual with no Allowance | 15,823 | 12,391
Nonaccrual loans | 25,462 | 21,706
Loans 90 days or more past due and still accruing | 1,310 | 1,287
Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 865,705 | 845,320
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 100 | 143
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 865,705 | 845,320
Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,520,261 | 1,589,975
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 0 | 0
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 1,520,261 | 1,589,975
Small Balance Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,179,749 | 1,200,251
Non-accrual with no Allowance | 2,138 | 2,927
Nonaccrual loans | 2,715 | 3,540
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 1,179,749 | 1,200,251
Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 696,864 | 645,071
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 0 | 0
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 696,864 | 645,071
Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 191,051 | 184,876
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 0 | 0
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 191,051 | 184,876
Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 362,425 | 325,816
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 0 | 0
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 362,425 | 325,816
One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 584,655 | 647,329
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 0 | 0
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 584,655 | 647,329
Land and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 329,438 | 328,475
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 172 | 181
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 329,438 | 328,475
Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,266,047 | 1,283,407
Non-accrual with no Allowance | 6,751 | 6,998
Nonaccrual loans | 7,315 | 7,356
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 1,266,047 | 1,283,407
Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 960,650 | 947,092
Non-accrual with no Allowance | 239 | 303
Nonaccrual loans | 2,050 | 2,530
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 960,650 | 947,092
Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 272,707 | 295,077
Non-accrual with no Allowance | 4,074 | 594
Nonaccrual loans | 4,074 | 594
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 272,707 | 295,077
One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,252,104 | 1,173,112
Non-accrual with no Allowance | 2,621 | 1,569
Nonaccrual loans | 6,789 | 5,236
Loans 90 days or more past due and still accruing | 445 | 1,023
Financing Receivable, before Allowance for Credit Loss | 1,252,104 | 1,173,112
Consumer—home equity revolving lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 564,334 | 566,291
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 2,243 | 2,124
Loans 90 days or more past due and still accruing | 852 | 254
Financing Receivable, before Allowance for Credit Loss | 564,334 | 566,291
Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 114,694 | 114,632
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 4 | 2
Loans 90 days or more past due and still accruing | 13 | 10
Financing Receivable, before Allowance for Credit Loss | 114,694 | 114,632
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 16,209 | 15,814
30 to 59 Days Past Due [Member] | Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
30 to 59 Days Past Due [Member] | Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
30 to 59 Days Past Due [Member] | Small Balance Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,095 | 1,859
30 to 59 Days Past Due [Member] | Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
30 to 59 Days Past Due [Member] | Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
30 to 59 Days Past Due [Member] | Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
30 to 59 Days Past Due [Member] | One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,756 | 900
30 to 59 Days Past Due [Member] | Land and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 682 | 921
30 to 59 Days Past Due [Member] | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 885 | 2,100
30 to 59 Days Past Due [Member] | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,943 | 1,479
30 to 59 Days Past Due [Member] | Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,173 | 1,185
30 to 59 Days Past Due [Member] | One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,889 | 5,287
30 to 59 Days Past Due [Member] | Consumer—home equity revolving lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,500 | 1,824
30 to 59 Days Past Due [Member] | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 286 | 259
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,585 | 7,429
60 to 89 Days Past Due [Member] | Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
60 to 89 Days Past Due [Member] | Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
60 to 89 Days Past Due [Member] | Small Balance Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
60 to 89 Days Past Due [Member] | Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
60 to 89 Days Past Due [Member] | Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
60 to 89 Days Past Due [Member] | Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
60 to 89 Days Past Due [Member] | One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
60 to 89 Days Past Due [Member] | Land and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
60 to 89 Days Past Due [Member] | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 132 | 4,145
60 to 89 Days Past Due [Member] | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 315 | 661
60 to 89 Days Past Due [Member] | Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,648 | 0
60 to 89 Days Past Due [Member] | One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,736 | 2,242
60 to 89 Days Past Due [Member] | Consumer—home equity revolving lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 673 | 203
60 to 89 Days Past Due [Member] | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 81 | 178
90 Days or More Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 16,457 | 9,128
90 Days or More Past Due [Member] | Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
90 Days or More Past Due [Member] | Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
90 Days or More Past Due [Member] | Small Balance Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2 | 2
90 Days or More Past Due [Member] | Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
90 Days or More Past Due [Member] | Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
90 Days or More Past Due [Member] | Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
90 Days or More Past Due [Member] | One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
90 Days or More Past Due [Member] | Land and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 96 | 97
90 Days or More Past Due [Member] | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,492 | 649
90 Days or More Past Due [Member] | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,609 | 1,019
90 Days or More Past Due [Member] | Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 842 | 594
90 Days or More Past Due [Member] | One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,294 | 5,175
90 Days or More Past Due [Member] | Consumer—home equity revolving lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,104 | 1,582
90 Days or More Past Due [Member] | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 18 | 10
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 37,251 | 32,371
Financial Asset, Past Due | Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Past Due | Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Past Due | Small Balance Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,097 | 1,861
Financial Asset, Past Due | Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Past Due | Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Past Due | Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Past Due | One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,756 | 900
Financial Asset, Past Due | Land and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 778 | 1,018
Financial Asset, Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 7,509 | 6,894
Financial Asset, Past Due | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,867 | 3,159
Financial Asset, Past Due | Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,663 | 1,779
Financial Asset, Past Due | One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 11,919 | 12,704
Financial Asset, Past Due | Consumer—home equity revolving lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,277 | 3,609
Financial Asset, Past Due | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 385 | 447
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 10,123,433 | 10,114,353
Financial Asset, Not Past Due | Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 865,705 | 845,320
Financial Asset, Not Past Due | Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,520,261 | 1,589,975
Financial Asset, Not Past Due | Small Balance Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,177,652 | 1,198,390
Financial Asset, Not Past Due | Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 696,864 | 645,071
Financial Asset, Not Past Due | Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 191,051 | 184,876
Financial Asset, Not Past Due | Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 362,425 | 325,816
Financial Asset, Not Past Due | One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 582,899 | 646,429
Financial Asset, Not Past Due | Land and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 328,660 | 327,457
Financial Asset, Not Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,258,538 | 1,276,513
Financial Asset, Not Past Due | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 956,783 | 943,933
Financial Asset, Not Past Due | Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 268,044 | 293,298
Financial Asset, Not Past Due | One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,240,185 | 1,160,408
Financial Asset, Not Past Due | Consumer—home equity revolving lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 560,057 | 562,682
Financial Asset, Not Past Due | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 114,309 | $ 114,185

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