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Purchased Loans (Details Textual) | 12 Months Ended
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Dec. 31, 2016 USD ($) loan | Dec. 31, 2015 USD ($) loan | Dec. 31, 2014 USD ($)
Loans and Allowance for Loan Losses (Textual) [Abstract] |  |  |
Restructured loans discontinued past due period | 90 days |  |
Allowance for loan losses attributable to restructured loans | $ 42,737,000 | $ 42,437,000 |
Purchased |  |  |
Loans and Allowance for Loan Losses (Textual) [Abstract] |  |  |
Nonperforming loans charged off past due period | 90 days |  |
Number of restructured loans | loan | 3 | 1 |
Restructured loans discontinued past due period | 90 days | 90 days |
Average recorded investment in impaired loans | $ 6,594,000 | $ 2,860,000 | $ 2,037,000
Interest income recognized on impaired loans |  |  | $ 59,000
Remaining availability under commitments to lend additional funds on restructured loans | 3,000 | 0 |
Fair value of loans contractual principal cash flows amount | 81,673,000 | 83,078,000 |
Fair value of loans contractual interest cash flows | 41,000 | 241,000 |
Fair value of loans contractual interest payments | 1,776,000 | 2,312,000 |
Fair value of loans contractual purchase discount | 34,550,000 | 45,980,000 |
Purchased | Nonaccruing Loans |  |  |
Loans and Allowance for Loan Losses (Textual) [Abstract] |  |  |
Outstanding balance of restructured loans | 0 | 275,000 |
Purchased | Restructured Loans |  |  |
Loans and Allowance for Loan Losses (Textual) [Abstract] |  |  |
Outstanding balance of restructured loans | 1,206,000 | 4,778,000 |
Allowance for loan losses attributable to restructured loans | $ 35,000 | $ 95,000 |

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- Definition Loans and the allowance for loan losses. + References No definition available. + Details
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524 + Details
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