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LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Age Analysis of Company's Past Due Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | $ 10,810,455 | $ 10,146,724
Financing Receivable, Nonaccrual, No Allowance | 11,714 | 12,391
Financing Receivable, Nonaccrual | 26,857 | 21,706
Loans 90 Days or More Past Due and Accruing | 2,745 | 1,287
Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 915,897 | 845,320
Loans receivable | 915,897 | 845,320
Financing Receivable, Nonaccrual, No Allowance | 1,391 | 0
Financing Receivable, Nonaccrual | 1,450 | 143
Loans 90 Days or More Past Due and Accruing | 0 | 0
Commercial real estate - investment properties [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,541,344 | 1,589,975
Loans receivable | 1,541,344 | 1,589,975
Financing Receivable, Nonaccrual, No Allowance | 0 | 0
Financing Receivable, Nonaccrual | 0 | 0
Loans 90 Days or More Past Due and Accruing | 0 | 0
Small Balance CRE [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,178,500 | 1,200,251
Loans receivable | 1,178,500 | 1,200,251
Financing Receivable, Nonaccrual, No Allowance | 755 | 2,927
Financing Receivable, Nonaccrual | 1,227 | 3,540
Loans 90 Days or More Past Due and Accruing | 0 | 0
Multifamily real estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 811,232 | 645,071
Loans receivable | 811,232 | 645,071
Financing Receivable, Nonaccrual, No Allowance | 0 | 0
Financing Receivable, Nonaccrual | 0 | 0
Loans 90 Days or More Past Due and Accruing | 0 | 0
Commercial Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 170,011 | 184,876
Loans receivable | 170,011 | 184,876
Financing Receivable, Nonaccrual, No Allowance | 0 | 0
Financing Receivable, Nonaccrual | 0 | 0
Loans 90 Days or More Past Due and Accruing | 0 | 0
Multifamily construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 503,993 | 325,816
Loans receivable | 503,993 | 325,816
Financing Receivable, Nonaccrual, No Allowance | 0 | 0
Financing Receivable, Nonaccrual | 0 | 0
Loans 90 Days or More Past Due and Accruing | 0 | 0
One-to four-family construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 526,432 | 647,329
Loans receivable | 526,432 | 647,329
Financing Receivable, Nonaccrual, No Allowance | 2,852 | 0
Financing Receivable, Nonaccrual | 3,105 | 0
Loans 90 Days or More Past Due and Accruing | 1,096 | 0
Land and Land Improvements [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 336,639 | 328,475
Loans receivable | 336,639 | 328,475
Financing Receivable, Nonaccrual, No Allowance | 0 | 0
Financing Receivable, Nonaccrual | 0 | 181
Loans 90 Days or More Past Due and Accruing | 42 | 0
Commercial business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,255,734 | 1,283,407
Loans receivable | 1,255,734 | 1,283,407
Financing Receivable, Nonaccrual, No Allowance | 789 | 6,998
Financing Receivable, Nonaccrual | 7,346 | 7,356
Loans 90 Days or More Past Due and Accruing | 0 | 0
Small Credit-Scored Business Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,022,154 | 947,092
Loans receivable | 1,022,154 | 947,092
Financing Receivable, Nonaccrual, No Allowance | 0 | 303
Financing Receivable, Nonaccrual | 1,656 | 2,530
Loans 90 Days or More Past Due and Accruing | 1 | 0
Agricultural business, including secured by farmland [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 331,089 | 295,077
Loans receivable | 331,089 | 295,077
Financing Receivable, Nonaccrual, No Allowance | 3,167 | 594
Financing Receivable, Nonaccrual | 3,167 | 594
Loans 90 Days or More Past Due and Accruing | 0 | 0
One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,518,046 | 1,173,112
Loans receivable | 1,518,046 | 1,173,112
Financing Receivable, Nonaccrual, No Allowance | 1,939 | 1,569
Financing Receivable, Nonaccrual | 5,702 | 5,236
Loans 90 Days or More Past Due and Accruing | 1,205 | 1,023
Home Equity Line of Credit [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 588,703 | 566,291
Loans receivable | 588,703 | 566,291
Financing Receivable, Nonaccrual, No Allowance | 821 | 0
Financing Receivable, Nonaccrual | 3,110 | 2,124
Loans 90 Days or More Past Due and Accruing | 391 | 254
Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 110,681 | 114,632
Loans receivable | 110,681 | 114,632
Financing Receivable, Nonaccrual, No Allowance | 0 | 0
Financing Receivable, Nonaccrual | 94 | 2
Loans 90 Days or More Past Due and Accruing | 10 | 10
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 15,936 | 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 [Member] |  |
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 [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 559 | 1,859
30 to 59 Days Past Due [Member] | Multifamily real estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
30 to 59 Days Past Due [Member] | Commercial Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
30 to 59 Days Past Due [Member] | Multifamily construction [Member] |  |
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 [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 286 | 900
30 to 59 Days Past Due [Member] | Land and Land Improvements [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,822 | 921
30 to 59 Days Past Due [Member] | Commercial business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,166 | 2,100
30 to 59 Days Past Due [Member] | Small Credit-Scored Business Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,050 | 1,479
30 to 59 Days Past Due [Member] | Agricultural business, including secured by farmland [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 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 | 6,864 | 5,287
30 to 59 Days Past Due [Member] | Home Equity Line of Credit [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,772 | 1,824
30 to 59 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 417 | 259
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 10,280 | 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 [Member] |  |
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 [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 [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
60 to 89 Days Past Due [Member] | Commercial Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
60 to 89 Days Past Due [Member] | Multifamily construction [Member] |  |
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 [Member] |  |
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 Improvements [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 553 | 0
60 to 89 Days Past Due [Member] | Commercial business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,735 | 4,145
60 to 89 Days Past Due [Member] | Small Credit-Scored Business Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 633 | 661
60 to 89 Days Past Due [Member] | Agricultural business, including secured by farmland [Member] |  |
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 residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,379 | 2,242
60 to 89 Days Past Due [Member] | Home Equity Line of Credit [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 839 | 203
60 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 141 | 178
90 Days or More Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 16,948 | 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 [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
90 Days or More Past Due [Member] | Small Balance CRE [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 413 | 2
90 Days or More Past Due [Member] | Multifamily real estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
90 Days or More Past Due [Member] | Commercial Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
90 Days or More Past Due [Member] | Multifamily construction [Member] |  |
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 [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,201 | 0
90 Days or More Past Due [Member] | Land and Land Improvements [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 42 | 97
90 Days or More Past Due [Member] | Commercial business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,181 | 649
90 Days or More Past Due [Member] | Small Credit-Scored Business Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 959 | 1,019
90 Days or More Past Due [Member] | Agricultural business, including secured by farmland [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,171 | 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 | 5,258 | 5,175
90 Days or More Past Due [Member] | Home Equity Line of Credit [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,627 | 1,582
90 Days or More Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 96 | 10
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 43,164 | 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 [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Past Due | Small Balance CRE [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 972 | 1,861
Financial Asset, Past Due | Multifamily real estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Past Due | Commercial Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Past Due | Multifamily construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Past Due | One-to four-family construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,487 | 900
Financial Asset, Past Due | Land and Land Improvements [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,417 | 1,018
Financial Asset, Past Due | Commercial business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 8,082 | 6,894
Financial Asset, Past Due | Small Credit-Scored Business Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,642 | 3,159
Financial Asset, Past Due | Agricultural business, including secured by farmland [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,171 | 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 | 14,501 | 12,704
Financial Asset, Past Due | Home Equity Line of Credit [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,238 | 3,609
Financial Asset, Past Due | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 654 | 447
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 10,767,291 | 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 | 915,897 | 845,320
Financial Asset, Not Past Due | Commercial real estate - investment properties [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,541,344 | 1,589,975
Financial Asset, Not Past Due | Small Balance CRE [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,177,528 | 1,198,390
Financial Asset, Not Past Due | Multifamily real estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 811,232 | 645,071
Financial Asset, Not Past Due | Commercial Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 170,011 | 184,876
Financial Asset, Not Past Due | Multifamily construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 503,993 | 325,816
Financial Asset, Not Past Due | One-to four-family construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 521,945 | 646,429
Financial Asset, Not Past Due | Land and Land Improvements [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 334,222 | 327,457
Financial Asset, Not Past Due | Commercial business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,247,652 | 1,276,513
Financial Asset, Not Past Due | Small Credit-Scored Business Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,018,512 | 943,933
Financial Asset, Not Past Due | Agricultural business, including secured by farmland [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 328,918 | 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 | 1,503,545 | 1,160,408
Financial Asset, Not Past Due | Home Equity Line of Credit [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 582,465 | 562,682
Financial Asset, Not Past Due | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 110,027 | $ 114,185

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- Definition Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 + Details
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- Definition Amortized cost of financing receivable 90 days or more past due and still accruing. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-80 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (b) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-7 + Details
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- Definition Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) -Publisher SEC Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-7 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-2 + Details
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