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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities $ 542,704 $ 547,749
Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 542,704 547,749
Loans receivable 891,901 747,302
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 542,704 547,749
Loans receivable 899,191 761,023
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 7,423 7,416
Loans receivable 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 535,281 540,333
Loans receivable 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 0 0
Loans receivable 899,191 761,023
Recurring | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 542,704 547,749
Recurring | Fair Value | U.S. Government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 66,587 68,970
Recurring | Fair Value | Obligations of states and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 143,105 290,299
Recurring | Fair Value | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 234,908 178,221
Recurring | Fair Value | Private label residential mortgage and asset backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 90,681 2,843
Recurring | Fair Value | Other equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 7,423 7,416
Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 7,423 7,416
Recurring | Level 1 | U.S. Government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 0 0
Recurring | Level 1 | Obligations of states and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 0 0
Recurring | Level 1 | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 0 0
Recurring | Level 1 | Private label residential mortgage and asset backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 0 0
Recurring | Level 1 | Other equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 7,423 7,416
Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 535,281 540,333
Recurring | Level 2 | U.S. Government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 66,587 68,970
Recurring | Level 2 | Obligations of states and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 143,105 290,299
Recurring | Level 2 | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 234,908 178,221
Recurring | Level 2 | Private label residential mortgage and asset backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 90,681 2,843
Recurring | Level 2 | Other equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 0 0
Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 0 0
Recurring | Level 3 | U.S. Government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 0 0
Recurring | Level 3 | Obligations of states and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 0 0
Recurring | Level 3 | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 0 0
Recurring | Level 3 | Private label residential mortgage and asset backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 0 0
Recurring | Level 3 | Other equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investment securities 0 0
Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other repossessed assets 70 362
Assets, fair value 70  
Nonrecurring | Carrying Value | Impaired loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable   62
Nonrecurring | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value   409
Nonrecurring | Fair Value | Impaired loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable   47
Nonrecurring | Fair Value | Consumer    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable   47
Nonrecurring | Fair Value | Consumer | Equity loans and lines of credit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable   47
Nonrecurring | Fair Value | Consumer | Impaired loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable   47
Nonrecurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other repossessed assets 0 0
Assets, fair value 0 0
Nonrecurring | Level 1 | Consumer    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable   0
Nonrecurring | Level 1 | Consumer | Equity loans and lines of credit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable   0
Nonrecurring | Level 1 | Consumer | Impaired loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable   0
Nonrecurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other repossessed assets 0 0
Assets, fair value 0 0
Nonrecurring | Level 2 | Consumer    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable   0
Nonrecurring | Level 2 | Consumer | Equity loans and lines of credit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable   0
Nonrecurring | Level 2 | Consumer | Impaired loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable   0
Nonrecurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other repossessed assets 70 362
Assets, fair value $ 70 409
Nonrecurring | Level 3 | Consumer    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable   47
Nonrecurring | Level 3 | Consumer | Equity loans and lines of credit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable   47
Nonrecurring | Level 3 | Consumer | Impaired loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable   $ 47