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Accounting Policies (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) Payment Quarter Segment shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016
Certificates of Deposits in Other Banks [Abstract] |  |  |
Maturity period of certificates of deposit in other banks | 18 months |  |
Loans [Abstract] |  |  |
Past due period after which loans must be well secured and in the process of collection to continue accruing interest | 90 days |  |
Period of current principal and interest payments for reclassifying nonaccrual loans as accruing loans | 6 months |  |
Allowance for Loan and Lease Losses [Abstract] |  |  |
Number of delinquent monthly payments before loan charge off | Payment | 5 |  |
Current value assessment period for past due loans secured against real estate | 90 days |  |
Threshold period past due for initiation of foreclosure proceedings | 120 days |  |
Historical loan loss review period | Quarter | 12 |  |
Goodwill and Core Deposit Intangible [Abstract] |  |  |
Goodwill | $ 65,490 | $ 65,490 |
Segment Reporting [Abstract] |  |  |
Number of operating segments | Segment | 1 |  |
New Accounting Standards [Abstract] |  |  |
Equity securities |  | 25,000 |
Unrealized holding loss on securities |  | (600) |
Deferred gains on sale of other real estate owned |  | $ 500 |
Federal corporate income tax rate | 21.00% | 35.00% | 35.00%
Minimum [Member] |  |  |
Other Real Estate Owned [Abstract] |  |  |
Typical frequency of periodic reviews | 12 months |  |
Maximum [Member] |  |  |
Other Real Estate Owned [Abstract] |  |  |
Typical frequency of periodic reviews | 18 months |  |
Frequency of periodic reviews in general | 24 months |  |
Visa Class B Restricted Stock [Member] |  |  |
New Accounting Standards [Abstract] |  |  |
Gain on recognition of fair value of equity securities | $ 1,200 |  |
Number of shares held in portfolio (in shares) | shares | 9,918 |  |
Buildings [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 40 years |  |
Furniture, Fixtures, and Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 2 years |  |
Furniture, Fixtures, and Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 10 years |  |
Commercial [Member] | Unsecured Commercial Loan [Member] |  |  |
Allowance for Loan and Lease Losses [Abstract] |  |  |
Charge off threshold for loans considered uncollectible | 90 days |  |
Consumer [Member] | Closed-End Consumer Loan [Member] |  |  |
Allowance for Loan and Lease Losses [Abstract] |  |  |
Charge off threshold for loans considered uncollectible | 120 days |  |
ASU 2018-03 [Member] | Visa Class B Restricted Stock [Member] |  |  |
New Accounting Standards [Abstract] |  |  |
Gain on recognition of fair value of equity securities | $ 1,200 |  |
Number of shares held in portfolio (in shares) | shares | 9,918 |  |
ASU 2018-11 [Member] |  |  |
New Accounting Standards [Abstract] |  |  |
Lease liability | $ 16,400 |  |
Lease right-of-use asset | 15,900 |  |
Cumulative-effect adjustment to retained earnings | $ 500 |  |

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