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Securities Available-for-Sale - Composition of Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 686,205 | $ 650,782
Gross Unrealized Gains | 10,754 | 11,897
Gross Unrealized Losses | (3,472) | (1,716)
Fair Value | 693,487 | 660,963
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 24,891 | 14,914
Gross Unrealized Gains | 47 | 27
Gross Unrealized Losses | (127) | 0
Fair Value | 24,811 | 14,941
Obligations of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 230,989 | 262,045
Gross Unrealized Gains | 1,573 | 1,825
Gross Unrealized Losses | (383) | (567)
Fair Value | 232,179 | 263,303
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 130,046 | 128,458
Gross Unrealized Gains | 465 | 693
Gross Unrealized Losses | (734) | (316)
Fair Value | 129,777 | 128,835
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 36,606 | 39,185
Gross Unrealized Gains | 984 | 1,091
Gross Unrealized Losses | (232) | (151)
Fair Value | 37,358 | 40,125
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 127,311 | 69,697
Gross Unrealized Gains | 243 | 183
Gross Unrealized Losses | (1,950) | (676)
Fair Value | 125,604 | 69,204
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 128,783 | 128,904
Gross Unrealized Gains | 3,772 | 5,988
Gross Unrealized Losses | (46) | (6)
Fair Value | 132,509 | 134,886
Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 678,626 | 643,203
Gross Unrealized Gains | 7,084 | 9,807
Gross Unrealized Losses | (3,472) | (1,716)
Fair Value | 682,238 | 651,294
Marketable equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,579 | 7,579
Gross Unrealized Gains | 3,670 | 2,090
Gross Unrealized Losses | 0 | 0
Fair Value | $ 11,249 | $ 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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