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Loans, Additional Information (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Pledged financial instruments, securities for federal home loan bank | $ 224,000,000 |  | $ 229,000,000
Troubled debt restructurings that subsequently defaulted within 12 months of the restructuring date | 1,236,000 | $ 0 |
Impaired loans modified without a valuation allowance | 23,000 | 375,000 |
Impaired loans modified with a valuation allowance | 0 | $ 34,000 |
Mortgage loans secured by residential real estate that were in the process of foreclosure | 402,000 |  |
Federal Home Loan Mortgage Corporation and Other Investors [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid principal balance of loans serviced for others | $ 99,324,000 |  | $ 100,982,000
Commercial and industrial [Member] | Minimum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Adjustable rate period | 1 month |  |
Commercial and industrial [Member] | Maximum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Adjustable rate period | 5 years |  |
Commercial, secured by real estate [Member] | Minimum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Adjustable rate period | 1 year |  |
Amortization period | 5 years |  |
Balloon payments period | 1 year |  |
Commercial, secured by real estate [Member] | Maximum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Adjustable rate period | 10 years |  |
Amortization period | 25 years |  |
Balloon payments period | 10 years |  |
Loan to appraised value ratio | 75.00% |  |
Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Home equity line of credit draw period | 5 years |  |
Residential real estate [Member] | Minimum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Adjustable rate period | 1 year |  |
Amortization period | 5 years |  |
Loan to appraised value ratio | 80.00% |  |
Residential real estate [Member] | Maximum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Adjustable rate period | 10 years |  |
Amortization period | 30 years |  |
Consumer [Member] | Maximum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amortization period | 72 months |  |

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