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Securities Available for Sale - Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 1,042,285 | $ 1,041,247
Gross unrealized gains | 5,643 | 7,558
Gross unrealized losses | (10,116) | (8,419)
Securities available for sale, at fair value | 1,037,812 | 1,040,386
US Treasury obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost |  | 7,995
Gross unrealized gains |  | 13
Gross unrealized losses |  | 0
Securities available for sale, at fair value |  | 8,008
Agency Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 19,014 | 57,123
Gross unrealized gains | 0 | 90
Gross unrealized losses | (9) | (25)
Securities available for sale, at fair value | 19,005 | 57,188
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 993,548 | 952,992
Gross unrealized gains | 4,914 | 7,249
Gross unrealized losses | (10,095) | (8,380)
Securities available for sale, at fair value | 988,367 | 951,861
State and municipal obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 3,259 | 3,727
Gross unrealized gains | 129 | 19
Gross unrealized losses | 0 | (3)
Securities available for sale, at fair value | 3,388 | 3,743
Corporate obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 26,047 | 19,013
Gross unrealized gains | 359 | 35
Gross unrealized losses | (12) | (11)
Securities available for sale, at fair value | 26,394 | 19,037
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 417 | 397
Gross unrealized gains | 241 | 152
Gross unrealized losses | 0 | 0
Securities available for sale, at fair value | $ 658 | $ 549

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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