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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, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 42,444 | $ 36,131
Current | 9,905,253 | 9,834,851
Total loans | 9,947,697 | 9,870,982
Non-accrual with no Allowance | 22,416 | 19,586
Nonaccrual loans | 35,031 | 32,560
Loans 90 days or more past due and still accruing | 1,561 | 3,054
Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 20,098 | 1,629
Current | 1,025,558 | 1,074,838
Total loans | 1,045,656 | 1,076,467
Non-accrual with no Allowance | 4,687 | 7,509
Nonaccrual loans | 5,416 | 8,429
Loans 90 days or more past due and still accruing | 0 | 0
Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 5,032 | 7,981
Current | 1,926,773 | 1,947,703
Total loans | 1,931,805 | 1,955,684
Non-accrual with no Allowance | 12,568 | 8,979
Nonaccrual loans | 12,568 | 8,979
Loans 90 days or more past due and still accruing | 0 | 0
Small balance CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 3,654 | 835
Current | 635,676 | 573,014
Total loans | 639,330 | 573,849
Non-accrual with no Allowance | 3,086 | 567
Nonaccrual loans | 3,631 | 791
Loans 90 days or more past due and still accruing | 0 | 0
Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Current | 433,775 | 428,223
Total loans | 433,775 | 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
Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 98 | 98
Current | 198,939 | 228,839
Total loans | 199,037 | 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
Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Current | 305,694 | 305,527
Total loans | 305,694 | 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
One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 170 | 687
Current | 542,670 | 507,123
Total loans | 542,840 | 507,810
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 687 | 331
Loans 90 days or more past due and still accruing | 0 | 0
Land and land development - residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 14 | 317
Current | 266,716 | 248,598
Total loans | 266,730 | 248,915
Non-accrual with no Allowance | 0 | 302
Nonaccrual loans | 201 | 507
Loans 90 days or more past due and still accruing | 0 | 0
Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 945 | 5,366
Current | 2,375,649 | 2,173,095
Total loans | 2,376,594 | 2,178,461
Non-accrual with no Allowance | 628 | 555
Nonaccrual loans | 1,266 | 1,988
Loans 90 days or more past due and still accruing | 0 | 889
Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 4,050 | 4,398
Current | 713,452 | 739,053
Total loans | 717,502 | 743,451
Non-accrual with no Allowance | 90 | 91
Nonaccrual loans | 2,928 | 3,419
Loans 90 days or more past due and still accruing | 37 | 136
Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,536 | 1,883
Current | 260,874 | 298,066
Total loans | 262,410 | 299,949
Non-accrual with no Allowance | 1,357 | 1,412
Nonaccrual loans | 1,536 | 1,743
Loans 90 days or more past due and still accruing | 0 | 0
One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 4,561 | 9,628
Current | 651,066 | 708,311
Total loans | 655,627 | 717,939
Non-accrual with no Allowance | 0 | 171
Nonaccrual loans | 4,456 | 3,556
Loans 90 days or more past due and still accruing | 1,524 | 1,899
Consumer secured by one- to four-family [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2,097 | 2,745
Current | 464,035 | 489,067
Total loans | 466,132 | 491,812
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 2,234 | 2,697
Loans 90 days or more past due and still accruing | 0 | 130
Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 189 | 564
Current | 104,376 | 113,394
Total loans | 104,565 | 113,958
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 10 | 22
Loans 90 days or more past due and still accruing | 0 | 0
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 19,091 | 10,675
30 to 59 Days Past Due [Member] | Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 14,824 | 0
30 to 59 Days Past Due [Member] | Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1 | 0
30 to 59 Days Past Due [Member] | Small balance CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 895 | 0
30 to 59 Days Past Due [Member] | Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
30 to 59 Days Past Due [Member] | Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
30 to 59 Days Past Due [Member] | Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
30 to 59 Days Past Due [Member] | One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 170 | 356
30 to 59 Days Past Due [Member] | Land and land development - residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
30 to 59 Days Past Due [Member] | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 159 | 3,247
30 to 59 Days Past Due [Member] | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,460 | 1,459
30 to 59 Days Past Due [Member] | Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 298
30 to 59 Days Past Due [Member] | One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 987 | 4,620
30 to 59 Days Past Due [Member] | Consumer secured by one- to four-family [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 464 | 459
30 to 59 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 131 | 236
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 9,681 | 2,908
60 to 89 Days Past Due [Member] | Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 4,687 | 182
60 to 89 Days Past Due [Member] | Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,322 | 0
60 to 89 Days Past Due [Member] | Small balance CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,978 | 45
60 to 89 Days Past Due [Member] | Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
60 to 89 Days Past Due [Member] | Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
60 to 89 Days Past Due [Member] | Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
60 to 89 Days Past Due [Member] | One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
60 to 89 Days Past Due [Member] | Land and land development - residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
60 to 89 Days Past Due [Member] | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 558 | 31
60 to 89 Days Past Due [Member] | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 948 | 891
60 to 89 Days Past Due [Member] | Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 37
60 to 89 Days Past Due [Member] | One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 21 | 955
60 to 89 Days Past Due [Member] | Consumer secured by one- to four-family [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 109 | 439
60 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 58 | 328
90 Days or More Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 13,672 | 22,548
90 Days or More Past Due [Member] | Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 587 | 1,447
90 Days or More Past Due [Member] | Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 3,709 | 7,981
90 Days or More Past Due [Member] | Small balance CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 781 | 790
90 Days or More Past Due [Member] | Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
90 Days or More Past Due [Member] | Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 98 | 98
90 Days or More Past Due [Member] | Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
90 Days or More Past Due [Member] | One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 331
90 Days or More Past Due [Member] | Land and land development - residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 14 | 317
90 Days or More Past Due [Member] | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 228 | 2,088
90 Days or More Past Due [Member] | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,642 | 2,048
90 Days or More Past Due [Member] | Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,536 | 1,548
90 Days or More Past Due [Member] | One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 3,553 | 4,053
90 Days or More Past Due [Member] | Consumer secured by one- to four-family [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,524 | 1,847
90 Days or More Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 0 | $ 0

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