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Fair Market Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Other real estate owned [Abstract] |  |  |  |  |  |
Maximum frequency of periodic reviews of real estate owned in general |  |  |  | 24 months |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Total recognized gains (losses) Included in net income | $ (351) |  | $ (39) | $ (381) | $ (546) |
Total gain (losses) for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date | (351) |  | (39) | (381) | (546) |
Total gains (losses), noninterest income | (351) |  | (39) | $ (381) | (546) |
Minimum [Member] |  |  |  |  |  |
Other real estate owned [Abstract] |  |  |  |  |  |
Frequency of periodic reviews |  |  |  | 12 months |  |
Maximum [Member] |  |  |  |  |  |
Other real estate owned [Abstract] |  |  |  |  |  |
Frequency of periodic reviews |  |  |  | 18 months |  |
Recurring [Member] | Fair Value [Member] |  |  |  |  |  |
Available-for-sale securities [Abstract] |  |  |  |  |  |
U.S. Treasury and government agencies | 202,050 | $ 188,932 |  | $ 202,050 |  | $ 188,932
State and political subdivisions | 135,459 | 137,458 |  | 135,459 |  | 137,458
U.S. government sponsored agency mortgage-backed securities | 214,176 | 288,907 |  | 214,176 |  | 288,907
CRA investment funds | 25,028 | 24,889 |  | 25,028 |  | 24,889
Mortgage servicing rights | 3,030 | 2,968 |  | 3,030 |  | 2,968
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |  |
Available-for-sale securities [Abstract] |  |  |  |  |  |
U.S. Treasury and government agencies | 19,997 | 492 |  | 19,997 |  | 492
State and political subdivisions | 0 | 0 |  | 0 |  | 0
U.S. government sponsored agency mortgage-backed securities | 0 | 0 |  | 0 |  | 0
CRA investment funds | 25,028 | 24,889 |  | 25,028 |  | 24,889
Mortgage servicing rights | 0 | 0 |  | 0 |  | 0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |  |
Available-for-sale securities [Abstract] |  |  |  |  |  |
U.S. Treasury and government agencies | 182,053 | 188,440 |  | 182,053 |  | 188,440
State and political subdivisions | 135,459 | 137,458 |  | 135,459 |  | 137,458
U.S. government sponsored agency mortgage-backed securities | 214,176 | 288,907 |  | 214,176 |  | 288,907
CRA investment funds | 0 | 0 |  | 0 |  | 0
Mortgage servicing rights | 0 | 0 |  | 0 |  | 0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |  |
Available-for-sale securities [Abstract] |  |  |  |  |  |
U.S. Treasury and government agencies | 0 | 0 |  | 0 |  | 0
State and political subdivisions | 0 | 0 |  | 0 |  | 0
U.S. government sponsored agency mortgage-backed securities | 0 | 0 |  | 0 |  | 0
CRA investment funds | 0 | 0 |  | 0 |  | 0
Mortgage servicing rights | 3,030 | 2,968 |  | 3,030 |  | 2,968
Recurring [Member] | Mortgage Servicing Rights [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Beginning balance | 3,235 | 3,112 | 3,062 | 2,968 | 3,424 | 3,424
Total recognized gains (losses) Included in net income | (228) |  | 80 | (37) | (212) |
Issues | 146 |  | 89 | 443 | 234 |
Settlements | (123) |  | (119) | (344) | (334) |
Ending balance | 3,030 | 2,968 | 3,112 | 3,030 | 3,112 | 2,968
Total gain (losses) for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date | (228) |  | 80 | (37) | (212) |
Total gains (losses), noninterest income | (228) |  | 80 | (37) | (212) |
Nonrecurring [Member] |  |  |  |  |  |
Impaired loan (collateral dependent) [Abstract] |  |  |  |  |  |
Impaired loans, fair value adjustments | 300 | 300 | 1,300 | 900 | 1,500 | 400
Other real estate owned [Abstract] |  |  |  |  |  |
Other real estate /assets owned, fair value adjustment | 800 | 300 | $ 200 | 1,100 | $ 1,400 | 1,700
Nonrecurring [Member] | Fair Value [Member] |  |  |  |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |
Impaired loans (collateral dependent) | 2,195 | 4,665 |  | 2,195 |  | 4,665
Other real estate /assets owned | 4,015 | 6,472 |  | 4,015 |  | 6,472
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |
Impaired loans (collateral dependent) | 0 | 0 |  | 0 |  | 0
Other real estate /assets owned | 0 | 0 |  | 0 |  | 0
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |
Impaired loans (collateral dependent) | 0 | 0 |  | 0 |  | 0
Other real estate /assets owned | 0 | 0 |  | 0 |  | 0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |
Impaired loans (collateral dependent) | 2,195 | 4,665 |  | 2,195 |  | 4,665
Other real estate /assets owned | $ 4,015 | $ 6,472 |  | $ 4,015 |  | $ 6,472

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