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Securities Available-for-Sale - Composition of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 649,198 | $ 650,782
Gross Unrealized Gains | 21,938 | 11,897
Gross Unrealized Losses | (8) | (1,716)
Fair Value | 671,128 | 660,963
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 14,944 | 14,914
Gross Unrealized Gains | 112 | 27
Gross Unrealized Losses |  | 0
Fair Value | 15,056 | 14,941
Obligations of U.S. Government Corporations and Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 246,259 | 262,045
Gross Unrealized Gains | 4,665 | 1,825
Gross Unrealized Losses | 0 | (567)
Fair Value | 250,924 | 263,303
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 134,675 | 128,458
Gross Unrealized Gains | 2,785 | 693
Gross Unrealized Losses | 0 | (316)
Fair Value | 137,460 | 128,835
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 34,685 | 39,185
Gross Unrealized Gains | 1,600 | 1,091
Gross Unrealized Losses | 0 | (151)
Fair Value | 36,285 | 40,125
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 86,827 | 69,697
Gross Unrealized Gains | 1,680 | 183
Gross Unrealized Losses | (8) | (676)
Fair Value | 88,499 | 69,204
Obligations of States and Political Subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 124,229 | 128,904
Gross Unrealized Gains | 8,307 | 5,988
Gross Unrealized Losses | 0 | (6)
Fair Value | 132,536 | 134,886
Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 641,619 | 643,203
Gross Unrealized Gains | 19,149 | 9,807
Gross Unrealized Losses | (8) | (1,716)
Fair Value | 660,760 | 651,294
Marketable Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,579 | 7,579
Gross Unrealized Gains | 2,789 | 2,090
Gross Unrealized Losses | 0 | 0
Fair Value | $ 10,368 | $ 9,669

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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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