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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 | Sep. 30, 2017 | Dec. 31, 2016
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Individually evaluated for impairment | $ 50,181 | $ 52,019
Collectively evaluated for impairment | 6,979,486 | 6,952,289
Total gross loans | 7,029,667 | 7,004,308
Mortgage Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Individually evaluated for impairment | 28,578 | 29,551
Collectively evaluated for impairment | 4,810,985 | 4,827,558
Total gross loans | 4,839,563 | 4,857,109
Commercial Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Individually evaluated for impairment | 19,393 | 20,255
Collectively evaluated for impairment | 1,689,449 | 1,610,189
Total gross loans | 1,708,842 | 1,630,444
Consumer Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Individually evaluated for impairment | 2,210 | 2,213
Collectively evaluated for impairment | 479,052 | 514,542
Total gross loans | $ 481,262 | $ 516,755

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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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