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Securities Available-for-Sale - Composition of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 656,668 | $ 629,463
Gross Unrealized Gains | 11,594 | 12,647
Gross Unrealized Losses | (1,638) | (1,837)
Fair Value | 666,624 | 640,273
US Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 14,893 | 14,873
Gross Unrealized Gains | 125 | 7
Fair Value | 15,018 | 14,880
Obligations of U.S. Government Corporations and Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 267,604 | 268,029
Gross Unrealized Gains | 2,935 | 2,334
Gross Unrealized Losses | (427) | (1,078)
Fair Value | 270,112 | 269,285
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 138,160 | 116,897
Gross Unrealized Gains | 1,549 | 1,257
Gross Unrealized Losses | (132) | (148)
Fair Value | 139,577 | 118,006
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 42,155 | 45,274
Gross Unrealized Gains | 1,450 | 1,548
Gross Unrealized Losses | (186) | (154)
Fair Value | 43,419 | 46,668
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 49,737 | 39,834
Gross Unrealized Gains | 312 | 232
Gross Unrealized Losses | (373) | (393)
Fair Value | 49,676 | 39,673
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 136,540 | 136,977
Gross Unrealized Gains | 3,927 | 5,789
Gross Unrealized Losses | (520) | (64)
Fair Value | 139,947 | 142,702
Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 649,089 | 621,884
Gross Unrealized Gains | 10,298 | 11,167
Gross Unrealized Losses | (1,638) | (1,837)
Fair Value | 657,749 | 631,214
Marketable Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,579 | 7,579
Gross Unrealized Gains | 1,296 | 1,480
Fair Value | $ 8,875 | $ 9,059

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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=51813488&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=27724398&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=49167202&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=27724398&loc=d3e27161-111563 + Details
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