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Securities Available-for-Sale - Composition of Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 690,472 | $ 686,205
Gross Unrealized Gains | 9,925 | 10,754
Gross Unrealized Losses | (2,443) | (3,472)
Fair Value | 697,954 | 693,487
U.S. treasury securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 24,930 | 24,891
Gross Unrealized Gains | 2 | 47
Gross Unrealized Losses | (38) | (127)
Fair Value | 24,894 | 24,811
Obligations of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 195,194 | 230,989
Gross Unrealized Gains | 1,171 | 1,573
Gross Unrealized Losses | (357) | (383)
Fair Value | 196,008 | 232,179
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 115,027 | 130,046
Gross Unrealized Gains | 476 | 465
Gross Unrealized Losses | (608) | (734)
Fair Value | 114,895 | 129,777
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 34,452 | 36,606
Gross Unrealized Gains | 896 | 984
Gross Unrealized Losses | (151) | (232)
Fair Value | 35,197 | 37,358
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 193,382 | 127,311
Gross Unrealized Gains | 511 | 243
Gross Unrealized Losses | (1,289) | (1,950)
Fair Value | 192,604 | 125,604
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 123,672 | 128,783
Gross Unrealized Gains | 5,632 | 3,772
Gross Unrealized Losses | 0 | (46)
Fair Value | 129,304 | 132,509
Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 686,657 | 678,626
Gross Unrealized Gains | 8,688 | 7,084
Gross Unrealized Losses | (2,443) | (3,472)
Fair Value | 692,902 | 682,238
Marketable equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,815 | 7,579
Gross Unrealized Gains | 1,237 | 3,670
Gross Unrealized Losses | 0 | 0
Fair Value | $ 5,052 | $ 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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