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Loans Receivable and Allowance for Loan Losses - Summary of Loans Receivable by Portfolio Segment and Impairment Method (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Individually evaluated for impairment | $ 86,046 | $ 70,641
Collectively evaluated for impairment | 9,753,812 | 7,266,923
Total gross loans | 9,839,858 | 7,337,564
Mortgage loans |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Individually evaluated for impairment | 48,783 | 39,910
Collectively evaluated for impairment | 6,731,039 | 5,271,535
Total gross loans | 6,779,822 | 5,311,445
Commercial loans |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Individually evaluated for impairment | 35,832 | 28,357
Collectively evaluated for impairment | 2,531,638 | 1,606,402
Total gross loans | 2,567,470 | 1,634,759
Consumer loans |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Individually evaluated for impairment | 1,431 | 2,374
Collectively evaluated for impairment | 491,135 | 388,986
Total gross loans | $ 492,566 | $ 391,360

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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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