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Securities - (Details Textual) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) security institution | Jun. 30, 2016 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized cost | $ 740,236,000 |  | $ 740,236,000 |  |  | $ 686,405,000
Gross gains on sales of securities available for sale | 0 | $ 1,257,000 | 0 | $ 1,257,000 |  |
Securities available for sale | 737,006,000 |  | $ 737,006,000 |  |  | 674,248,000
Number of securities representing interests in tranches of trusts (tranches) | security |  |  | 3 |  |  |
Number of institutions issuing debt | institution |  |  | 250 |  |  |
Trust preferred securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized cost | 21,793,000 |  | $ 21,793,000 |  |  | 23,749,000
Securities available for sale | 16,992,000 |  | 16,992,000 |  |  | 18,389,000
Impairments |  |  | 0 |  |  |
Secure government, public and trust deposits |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available for sale securities pledged as collateral | 349,741,000 |  | 349,741,000 |  |  | 642,447,000
Short-term borrowings |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available for sale securities pledged as collateral | $ 21,163,000 |  | 21,163,000 |  |  | $ 24,426,000
Residential mortgage-backed securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available for sale debt securities |  |  |  |  | $ 2,946,000 |
Sale proceeds |  |  | $ 2,946,000 |  |  |
Other equity securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Sale proceeds |  |  |  | 4,028,000 |  |
Amortized cost |  | $ 2,842,000 |  | 2,842,000 |  |
Gross gains on sales of securities available for sale |  |  |  | $ 1,186,000 |  |

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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