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Securities Available-for-Sale - Composition of Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 681,758 | $ 686,205
Gross Unrealized Gains | 10,014 | 10,754
Gross Unrealized Losses | (2,384) | (3,472)
Fair Value | 689,388 | 693,487
U.S. treasury securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 24,917 | 24,891
Gross Unrealized Gains | 2 | 47
Gross Unrealized Losses | (33) | (127)
Fair Value | 24,886 | 24,811
Obligations of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 210,459 | 230,989
Gross Unrealized Gains | 1,328 | 1,573
Gross Unrealized Losses | (353) | (383)
Fair Value | 211,434 | 232,179
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 120,272 | 130,046
Gross Unrealized Gains | 527 | 465
Gross Unrealized Losses | (596) | (734)
Fair Value | 120,203 | 129,777
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 33,850 | 36,606
Gross Unrealized Gains | 948 | 984
Gross Unrealized Losses | (187) | (232)
Fair Value | 34,611 | 37,358
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 162,981 | 127,311
Gross Unrealized Gains | 646 | 243
Gross Unrealized Losses | (1,214) | (1,950)
Fair Value | 162,413 | 125,604
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 125,464 | 128,783
Gross Unrealized Gains | 5,642 | 3,772
Gross Unrealized Losses | 0 | (46)
Fair Value | 131,106 | 132,509
Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 677,943 | 678,626
Gross Unrealized Gains | 9,093 | 7,084
Gross Unrealized Losses | (2,383) | (3,472)
Fair Value | 684,653 | 682,238
Marketable equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,815 | 7,579
Gross Unrealized Gains | 921 | 3,670
Gross Unrealized Losses | (1) | 0
Fair Value | $ 4,735 | $ 11,249

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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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