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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Age Analysis of Company's Past Due Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 9,218,384 | $ 9,870,982
Non-accrual with no Allowance | 15,784 | 19,586
Nonaccrual loans | 24,039 | 32,560
Loans 90 days or more past due and still accruing | 4,822 | 3,054
Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,122,275 | 1,076,467
Non-accrual with no Allowance | 3,952 | 7,509
Nonaccrual loans | 4,535 | 8,429
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 1,122,275 | 1,076,467
Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,980,284 | 1,955,684
Non-accrual with no Allowance | 7,468 | 8,979
Nonaccrual loans | 7,620 | 8,979
Loans 90 days or more past due and still accruing | 3,955 | 0
Financing Receivable, before Allowance for Credit Loss | 1,980,284 | 1,955,684
Small balance CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 601,751 | 573,849
Non-accrual with no Allowance | 2,440 | 567
Nonaccrual loans | 2,776 | 791
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 601,751 | 573,849
Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 532,760 | 428,223
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 | 532,760 | 428,223
Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 170,205 | 228,937
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 98 | 98
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 170,205 | 228,937
Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 278,184 | 305,527
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 | 278,184 | 305,527
One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 571,431 | 507,810
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 0 | 331
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 571,431 | 507,810
Land and land development - residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 308,164 | 248,915
Non-accrual with no Allowance | 0 | 302
Nonaccrual loans | 256 | 507
Loans 90 days or more past due and still accruing | 0 | 0
Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,346,707 | 2,178,461
Non-accrual with no Allowance | 820 | 555
Nonaccrual loans | 1,326 | 1,988
Loans 90 days or more past due and still accruing | 0 | 889
Financing Receivable, before Allowance for Credit Loss | 1,346,707 | 2,178,461
Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 775,554 | 743,451
Non-accrual with no Allowance | 83 | 91
Nonaccrual loans | 1,374 | 3,419
Loans 90 days or more past due and still accruing | 61 | 136
Financing Receivable, before Allowance for Credit Loss | 775,554 | 743,451
Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 287,469 | 299,949
Non-accrual with no Allowance | 1,021 | 1,412
Nonaccrual loans | 1,022 | 1,743
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 287,469 | 299,949
One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 682,368 | 717,939
Non-accrual with no Allowance | 0 | 171
Nonaccrual loans | 3,182 | 3,556
Loans 90 days or more past due and still accruing | 772 | 1,899
Financing Receivable, before Allowance for Credit Loss | 682,368 | 717,939
Consumer secured by one- to four-family [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 462,819 | 491,812
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 1,831 | 2,697
Loans 90 days or more past due and still accruing | 30 | 130
Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 98,413 | 113,958
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 19 | 22
Loans 90 days or more past due and still accruing | 4 | 0
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,772 | 10,675
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 CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2 | 0
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 | 4,886 | 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 | 0 | 356
30 to 59 Days Past Due [Member] | Land and land development - residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
30 to 59 Days Past Due [Member] | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 117 | 3,247
30 to 59 Days Past Due [Member] | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 506 | 1,459
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 | 0 | 298
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 | 107 | 4,620
30 to 59 Days Past Due [Member] | Consumer secured by one- to four-family [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 840 | 459
30 to 59 Days Past Due [Member] | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 314 | 236
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,187 | 2,908
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 | 182
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 CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 43 | 45
60 to 89 Days Past Due [Member] | Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 342 | 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 - residential [Member] |  |
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 | 167 | 31
60 to 89 Days Past Due [Member] | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 328 | 891
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 | 0 | 37
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 | 109 | 955
60 to 89 Days Past Due [Member] | Consumer secured by one- to four-family [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 164 | 439
60 to 89 Days Past Due [Member] | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 34 | 328
90 Days or More Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 10,660 | 22,548
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 | 495 | 1,447
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 | 5,185 | 7,981
90 Days or More Past Due [Member] | Small balance CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 790
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 | 98 | 98
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 | 331
90 Days or More Past Due [Member] | Land and land development - residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 14 | 317
90 Days or More Past Due [Member] | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 847 | 2,088
90 Days or More Past Due [Member] | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 906 | 2,048
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 | 1,022 | 1,548
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 | 1,370 | 4,053
90 Days or More Past Due [Member] | Consumer secured by one- to four-family [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 719 | 1,847
90 Days or More Past Due [Member] | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4 | 0
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 18,619 | 36,131
Financial Asset, Past Due | Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 495 | 1,629
Financial Asset, Past Due | Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,185 | 7,981
Financial Asset, Past Due | Small balance CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 45 | 835
Financial Asset, Past Due | Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 342 | 0
Financial Asset, Past Due | Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 98 | 98
Financial Asset, Past Due | Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,886 | 0
Financial Asset, Past Due | One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 687
Financial Asset, Past Due | Land and land development - residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 14 | 317
Financial Asset, Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,131 | 5,366
Financial Asset, Past Due | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,740 | 4,398
Financial Asset, Past Due | Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,022 | 1,883
Financial Asset, Past Due | One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,586 | 9,628
Financial Asset, Past Due | Consumer secured by one- to four-family [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,723 | 2,745
Financial Asset, Past Due | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 352 | 564
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 9,199,765 | 9,834,851
Financial Asset, Not Past Due | Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,121,780 | 1,074,838
Financial Asset, Not Past Due | Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,975,099 | 1,947,703
Financial Asset, Not Past Due | Small balance CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 601,706 | 573,014
Financial Asset, Not Past Due | Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 532,418 | 428,223
Financial Asset, Not Past Due | Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 170,107 | 228,839
Financial Asset, Not Past Due | Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 273,298 | 305,527
Financial Asset, Not Past Due | One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 571,431 | 507,123
Financial Asset, Not Past Due | Land and land development - residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 308,150 | 248,598
Financial Asset, Not Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,345,576 | 2,173,095
Financial Asset, Not Past Due | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 773,814 | 739,053
Financial Asset, Not Past Due | Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 286,447 | 298,066
Financial Asset, Not Past Due | One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 680,782 | 708,311
Financial Asset, Not Past Due | Consumer secured by one- to four-family [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 461,096 | 489,067
Financial Asset, Not Past Due | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 98,061 | $ 113,394

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