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Fair Value Measurements and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | $ 0 | $ 0 | $ 0 | $ 0 |
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0 | 0 | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 | 0 | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 | $ 0 | 0 | $ 0 |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 1,365,521 |  | 1,365,521 |  | $ 1,338,290
Trading securities | 10,406 |  | 10,406 |  | 9,259
Liabilities [Abstract] |  |  |  |  |
Collateral dependent impaired financing receivable with specific reserves | 800 |  | 800 |  | 7,000
Allowance for loan losses for collateral dependent impaired loans with specific reserves | 500 |  | $ 500 |  | 1,500
Minimum [Member] |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Liquidation expense ratio on impaired collateral |  |  | 10.00% |  |
Maximum [Member] |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Liquidation expense ratio on impaired collateral |  |  | 35.00% |  |
Federal Agency [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 159,520 |  | $ 159,520 |  | 174,408
State & Municipal [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 44,020 |  | 44,020 |  | 46,726
Other Securities [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 19,012 |  | 19,012 |  | 20,739
Recurring Basis [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 1,365,521 |  | 1,365,521 |  | 1,338,290
Trading securities | 10,406 |  | 10,406 |  | 9,259
Derivatives | 5,631 |  | 5,631 |  | 3,210
Total | 1,381,558 |  | 1,381,558 |  | 1,350,759
Liabilities [Abstract] |  |  |  |  |
Derivatives | 2,960 |  | 2,960 |  | 506
Total | 2,960 |  | 2,960 |  | 506
Recurring Basis [Member] | Level 1 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 10,744 |  | 10,744 |  | 11,493
Trading securities | 10,406 |  | 10,406 |  | 9,259
Derivatives | 0 |  | 0 |  | 0
Total | 21,150 |  | 21,150 |  | 20,752
Liabilities [Abstract] |  |  |  |  |
Derivatives | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Recurring Basis [Member] | Level 2 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 1,354,777 |  | 1,354,777 |  | 1,326,797
Trading securities | 0 |  | 0 |  | 0
Derivatives | 5,631 |  | 5,631 |  | 3,210
Total | 1,360,408 |  | 1,360,408 |  | 1,330,007
Liabilities [Abstract] |  |  |  |  |
Derivatives | 2,960 |  | 2,960 |  | 506
Total | 2,960 |  | 2,960 |  | 506
Recurring Basis [Member] | Level 3 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 0 |  | 0 |  | 0
Trading securities | 0 |  | 0 |  | 0
Derivatives | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Liabilities [Abstract] |  |  |  |  |
Derivatives | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Recurring Basis [Member] | Federal Agency [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 159,520 |  | 159,520 |  | 174,408
Recurring Basis [Member] | Federal Agency [Member] | Level 1 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 0 |  | 0 |  | 0
Recurring Basis [Member] | Federal Agency [Member] | Level 2 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 159,520 |  | 159,520 |  | 174,408
Recurring Basis [Member] | Federal Agency [Member] | Level 3 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 0 |  | 0 |  | 0
Recurring Basis [Member] | State & Municipal [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 44,020 |  | 44,020 |  | 46,726
Recurring Basis [Member] | State & Municipal [Member] | Level 1 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 0 |  | 0 |  | 0
Recurring Basis [Member] | State & Municipal [Member] | Level 2 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 44,020 |  | 44,020 |  | 46,726
Recurring Basis [Member] | State & Municipal [Member] | Level 3 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 0 |  | 0 |  | 0
Recurring Basis [Member] | Mortgage-Backed [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 564,061 |  | 564,061 |  | 529,844
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 1 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 0 |  | 0 |  | 0
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 2 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 564,061 |  | 564,061 |  | 529,844
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 3 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 0 |  | 0 |  | 0
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 578,908 |  | 578,908 |  | 566,573
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 1 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 0 |  | 0 |  | 0
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 578,908 |  | 578,908 |  | 566,573
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 3 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 0 |  | 0 |  | 0
Recurring Basis [Member] | Other Securities [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 19,012 |  | 19,012 |  | 20,739
Recurring Basis [Member] | Other Securities [Member] | Level 1 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 10,744 |  | 10,744 |  | 11,493
Recurring Basis [Member] | Other Securities [Member] | Level 2 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | 8,268 |  | 8,268 |  | 9,246
Recurring Basis [Member] | Other Securities [Member] | Level 3 [Member] |  |  |  |  |
AFS securities [Abstract] |  |  |  |  |
AFS Securities | $ 0 |  | $ 0 |  | $ 0

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