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Securities Available-for-Sale - Composition of Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 704,624 | $ 686,205
Gross Unrealized Gains | 11,824 | 10,754
Gross Unrealized Losses | (3,250) | (3,472)
Fair Value | 713,198 | 693,487
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 24,904 | 24,891
Gross Unrealized Gains | 24 | 47
Gross Unrealized Losses | (91) | (127)
Fair Value | 24,837 | 24,811
Obligations of U.S. Government Corporations and Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 220,721 | 230,989
Gross Unrealized Gains | 1,408 | 1,573
Gross Unrealized Losses | (421) | (383)
Fair Value | 221,708 | 232,179
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 125,466 | 130,046
Gross Unrealized Gains | 462 | 465
Gross Unrealized Losses | (773) | (734)
Fair Value | 125,155 | 129,777
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 35,132 | 36,606
Gross Unrealized Gains | 928 | 984
Gross Unrealized Losses | (236) | (232)
Fair Value | 35,824 | 37,358
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 163,396 | 127,311
Gross Unrealized Gains | 308 | 243
Gross Unrealized Losses | (1,727) | (1,950)
Fair Value | 161,977 | 125,604
Obligations of States and Political Subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 127,638 | 128,783
Gross Unrealized Gains | 4,659 | 3,772
Gross Unrealized Losses | 0 | (46)
Fair Value | 132,297 | 132,509
Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 697,257 | 678,626
Gross Unrealized Gains | 7,789 | 7,084
Gross Unrealized Losses | (3,248) | (3,472)
Fair Value | 701,798 | 682,238
Marketable Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,367 | 7,579
Gross Unrealized Gains | 4,035 | 3,670
Gross Unrealized Losses | (2) | 0
Fair Value | $ 11,400 | $ 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=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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