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Investment Securities (Securities Available for Sale) (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 1,025,030 | $ 1,041,247
Gross unrealized gains | 8,225 | 7,558
Gross unrealized losses | (4,950) | (8,419)
Fair value | 1,028,305 | 1,040,386
U.S. Treasury Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 5,995 | 7,995
Gross unrealized gains | 0 | 13
Gross unrealized losses | (1) | 0
Fair value | 5,994 | 8,008
Agency Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 28,031 | 57,123
Gross unrealized gains | 15 | 90
Gross unrealized losses | (11) | (25)
Fair value | 28,035 | 57,188
Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 965,863 | 952,992
Gross unrealized gains | 7,477 | 7,249
Gross unrealized losses | (4,928) | (8,380)
Fair value | 968,412 | 951,861
State And Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 3,695 | 3,727
Gross unrealized gains | 112 | 19
Gross unrealized losses | 0 | (3)
Fair value | 3,807 | 3,743
Corporate Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 21,049 | 19,013
Gross unrealized gains | 420 | 35
Gross unrealized losses | (10) | (11)
Fair value | 21,459 | 19,037
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 397 | 397
Gross unrealized gains | 201 | 152
Gross unrealized losses | 0 | 0
Fair value | $ 598 | $ 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 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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