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Investment Securities - Summary of Amortized Cost of Securities and Fair Values (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | $ 556,075 | $ 588,459
Gross unrealized gains | 4,297 | 3,943
Gross unrealized losses | (7,015) | (10,219)
Available-for-sale securities, at fair value | 553,357 | 582,183
Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | 547,295 | 579,715
Gross unrealized gains | 4,296 | 3,942
Gross unrealized losses | (6,885) | (10,084)
Available-for-sale securities, at fair value | 544,706 | 573,573
Debt Securities | U.S. Government Agency Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | 999 | 998
Gross unrealized losses | (9) | (13)
Available-for-sale securities, at fair value | 990 | 985
Debt Securities | Mortgage-backed Securities - Residential |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | 416,011 | 450,874
Gross unrealized gains | 679 | 939
Gross unrealized losses | (5,982) | (7,905)
Available-for-sale securities, at fair value | 410,708 | 443,908
Debt Securities | Municipals, Tax Exempt |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | 119,960 | 116,034
Gross unrealized gains | 3,617 | 3,003
Gross unrealized losses | (879) | (2,114)
Available-for-sale securities, at fair value | 122,698 | 116,923
Debt Securities | Treasury Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | 10,325 | 11,809
Gross unrealized losses | (15) | (52)
Available-for-sale securities, at fair value | 10,310 | 11,757
Equity Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost | 8,780 | 8,744
Gross unrealized gains | 1 | 1
Gross unrealized losses | (130) | (135)
Available-for-sale securities, at fair value | $ 8,651 | $ 8,610

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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=65884222&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=73527792&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=66010992&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=73527792&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=73527792&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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