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Loans Receivable and Allowance for Credit Losses - Allowance for Credit Losses on Financing Receivables (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2020
Allowance for Loan Losses and the Loans Receivables by Impairment Methodology |  |  |  |  |
Accrued interest receivable on loans |  |  |  | $ 55,900 | $ 54,600
Allowance for Loan Losses by Portfolio Segment |  |  |  |  |
Balance, beginning of period | $ 206,741 | $ 94,144 | $ 94,144 |  |
Provision (credit) for credit/loan losses | 3,300 | 28,000 |  |  |
Loans charged off | (3,521) | (5,957) |  |  |
Recoveries of charge offs | 1,423 | 2,536 |  |  |
Balance, end of period | 207,943 | 144,923 | 206,741 |  |
Allowance for credit losses: |  |  |  |  |
Individually evaluated |  |  |  | 20,641 | 7,325
Collectively evaluated |  |  |  | 187,302 | 199,416
Total | 206,741 | 144,923 | $ 206,741 | 207,943 | 206,741
Loans outstanding: |  |  |  |  |
Individually evaluated |  |  |  | 151,953 | 123,203
Collectively evaluated |  |  |  | 13,550,676 | 13,440,010
Total |  |  |  | 13,702,629 | 13,563,213
Reserve for unfunded loan commitments recorded in other liabilities |  |  |  | 1,400 | 1,300
Additions to reserves for unfunded loan commitments recorded in credit related expenses | 105 | $ 610 |  |  |
CECL impact |  | us-gaap:AccountingStandardsUpdate201613Member | Accounting Standards Update 2020-06 |  |
Financing Receivable, Accrued Interest, Allowance For Credit Loss | 600 | $ 0 |  |  |
COVID-19 Payment Deferral Modifications |  |  |  |  |
Loans outstanding: |  |  |  |  |
Financing Receivable, Accrued Interest, Allowance For Credit Loss | 1,300 |  | $ 1,000 |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment |  |  |  |  |
Balance, end of period |  | 26,200 |  |  |
Allowance for credit losses: |  |  |  |  |
Total |  | 26,200 |  |  |
Real estate |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment |  |  |  |  |
Balance, beginning of period | 162,196 | 53,593 | 53,593 |  |
Provision (credit) for credit/loan losses | 2,345 | 15,491 |  |  |
Loans charged off | (2,818) | (2,397) |  |  |
Recoveries of charge offs | 584 | 167 |  |  |
Balance, end of period | 162,307 | 94,645 | 162,196 |  |
Allowance for credit losses: |  |  |  |  |
Individually evaluated |  |  |  | 16,641 | 3,683
Collectively evaluated |  |  |  | 145,666 | 158,513
Total | 162,196 | 94,645 | 162,196 | 162,307 | 162,196
Loans outstanding: |  |  |  |  |
Individually evaluated |  |  |  | 125,326 | 93,476
Collectively evaluated |  |  |  | 8,686,097 | 8,678,658
Total |  |  |  | 8,811,423 | 8,772,134
Real estate | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment |  |  |  |  |
Balance, end of period |  | 27,791 |  |  |
Allowance for credit losses: |  |  |  |  |
Total |  | 27,791 |  |  |
Commercial business |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment |  |  |  |  |
Balance, beginning of period | 39,155 | 33,032 | 33,032 |  |
Provision (credit) for credit/loan losses | 2,625 | 11,549 |  |  |
Loans charged off | (610) | (3,035) |  |  |
Recoveries of charge offs | 690 | 2,359 |  |  |
Balance, end of period | 41,860 | 42,883 | 39,155 |  |
Allowance for credit losses: |  |  |  |  |
Individually evaluated |  |  |  | 3,969 | 3,575
Collectively evaluated |  |  |  | 37,891 | 35,580
Total | 39,155 | 42,883 | 39,155 | 41,860 | 39,155
Loans outstanding: |  |  |  |  |
Individually evaluated |  |  |  | 22,620 | 25,706
Collectively evaluated |  |  |  | 4,323,624 | 4,132,081
Total |  |  |  | 4,346,244 | 4,157,787
Commercial business | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment |  |  |  |  |
Balance, end of period |  | (1,022) |  |  |
Allowance for credit losses: |  |  |  |  |
Total |  | (1,022) |  |  |
Residential mortgage |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment |  |  |  |  |
Balance, beginning of period | 4,227 | 5,925 | 5,925 |  |
Provision (credit) for credit/loan losses | (1,492) | 397 |  |  |
Loans charged off | 0 | 0 |  |  |
Recoveries of charge offs | 0 | 0 |  |  |
Balance, end of period | 2,735 | 5,779 | 4,227 |  |
Allowance for credit losses: |  |  |  |  |
Individually evaluated |  |  |  | 16 | 25
Collectively evaluated |  |  |  | 2,719 | 4,202
Total | 4,227 | 5,779 | 4,227 | 2,735 | 4,227
Loans outstanding: |  |  |  |  |
Individually evaluated |  |  |  | 3,379 | 3,416
Collectively evaluated |  |  |  | 497,621 | 578,816
Total |  |  |  | 501,000 | 582,232
Residential mortgage | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment |  |  |  |  |
Balance, end of period |  | (543) |  |  |
Allowance for credit losses: |  |  |  |  |
Total |  | (543) |  |  |
Consumer and other |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment |  |  |  |  |
Balance, beginning of period | 1,163 | 1,594 | 1,594 |  |
Provision (credit) for credit/loan losses | (178) | 563 |  |  |
Loans charged off | (93) | (525) |  |  |
Recoveries of charge offs | 149 | 10 |  |  |
Balance, end of period | 1,041 | 1,616 | 1,163 |  |
Allowance for credit losses: |  |  |  |  |
Individually evaluated |  |  |  | 15 | 42
Collectively evaluated |  |  |  | 1,026 | 1,121
Total | $ 1,163 | 1,616 | $ 1,163 | 1,041 | 1,163
Loans outstanding: |  |  |  |  |
Individually evaluated |  |  |  | 628 | 605
Collectively evaluated |  |  |  | 43,334 | 50,455
Total |  |  |  | $ 43,962 | $ 51,060
Consumer and other | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Allowance for Loan Losses by Portfolio Segment |  |  |  |  |
Balance, end of period |  | (26) |  |  |
Allowance for credit losses: |  |  |  |  |
Total |  | $ (26) |  |  |

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