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Fair Value of Assets and Liabilities, Part II (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Foreclosed Assets Held for Sale [Abstract]    
Other real estate owned $ 2,229,000 $ 1,982,000
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]    
Assets, Fair Value Disclosure, Recurring 2,701,000 1,652,000
Financial Assets [Abstract]    
Available-for-sale securities 621,204,000 619,848,000
Held-to-maturity Securities 69,306,000 74,231,000
Held-to-maturity Securities, Fair Value 69,137,000 73,096,000
Financial Liabilities [Abstract]    
Other borrowings 31,250,000 18,063,000
Carrying Amount [Member]    
Financial Assets [Abstract]    
Cash and due from banks 69,153,000 137,002,000
Federal funds sold 490,000 38,900,000
Certificates of deposit investments 1,685,000 14,643,000
Available-for-sale securities 621,204,000 619,848,000
Held-to-maturity Securities 69,306,000 74,231,000
Loans held for sale 2,079,000 1,175,000
Loans net of allowance for loan losses 1,846,894,000 1,808,064,000
Interest receivable 10,876,000 10,553,000
Federal Reserve Bank stock 5,160,000 3,949,000
Federal Home Loan Bank stock 3,302,000 4,389,000
Financial Liabilities [Abstract]    
Deposits 2,217,477,000 2,329,887,000
Securities sold under agreements to repurchase 116,360,000 185,763,000
Interest payable 552,000 535,000
Federal Home Loan Bank borrowings 87,052,000 40,094,000
Other Liabilities, Fair Value Disclosure   18,063,000
Other borrowings 31,250,000  
Junior subordinated debentures 23,980,000 23,917,000
Fair Value [Member]    
Financial Assets [Abstract]    
Cash and due from banks 69,153,000 137,002,000
Federal funds sold 490,000 38,900,000
Certificates of deposit investments 1,708,000 14,651,000
Available-for-sale securities 621,204,000 619,848,000
Held-to-maturity Securities, Fair Value 69,137,000 73,096,000
Loans held for sale 2,079,000 1,175,000
Loans net of allowance for loan losses 1,842,343,000 1,795,764,000
Interest receivable 10,876,000 10,553,000
Federal Reserve Bank stock 5,160,000 3,949,000
Federal Home Loan Bank stock 3,302,000 4,389,000
Financial Liabilities [Abstract]    
Deposits 2,217,528,000 2,331,725,000
Securities sold under agreements to repurchase 116,348,000 185,766,000
Interest payable 552,000 535,000
Federal Home Loan Bank borrowings 87,396,000 40,318,000
Other Liabilities, Fair Value Disclosure   18,063,000
Other borrowings 31,250,000  
Junior subordinated debentures 17,640,000 17,068,000
Fair Value, Measurements, Nonrecurring [Member] | Carrying Amount [Member]    
Foreclosed Assets Held for Sale [Abstract]    
Other real estate owned 2,229,000  
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member]    
Foreclosed Assets Held for Sale [Abstract]    
Other real estate owned 307,000  
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Assets [Abstract]    
Cash and due from banks 69,153,000 137,002,000
Federal funds sold 490,000 38,900,000
Certificates of deposit investments 0 0
Available-for-sale securities 175,000 144,000
Held-to-maturity Securities, Fair Value 0 0
Loans held for sale 0 0
Loans net of allowance for loan losses 0 0
Interest receivable 0 0
Federal Reserve Bank stock 0 0
Federal Home Loan Bank stock 0 0
Financial Liabilities [Abstract]    
Deposits 0 0
Securities sold under agreements to repurchase 0 0
Interest payable 0 0
Federal Home Loan Bank borrowings 0 0
Other borrowings 20,000,000 0
Junior subordinated debentures 0 0
Significant Other Observable Inputs (Level 2)    
Financial Assets [Abstract]    
Cash and due from banks 0 0
Federal funds sold 0 0
Certificates of deposit investments 1,708,000 14,651,000
Available-for-sale securities 618,328,000 618,052,000
Held-to-maturity Securities, Fair Value 69,137,000 73,096,000
Loans held for sale 2,079,000 1,175,000
Loans net of allowance for loan losses 0 0
Interest receivable 10,876,000 10,553,000
Federal Reserve Bank stock 5,160,000 3,949,000
Federal Home Loan Bank stock 3,302,000 4,389,000
Financial Liabilities [Abstract]    
Deposits 1,897,161,000 1,976,806,000
Securities sold under agreements to repurchase 116,348,000 185,766,000
Interest payable 552,000 535,000
Federal Home Loan Bank borrowings 87,396,000 40,318,000
Other borrowings 11,250,000 18,063,000
Junior subordinated debentures 17,640,000 17,068,000
Significant Unobservable Inputs (Level 3)    
Financial Assets [Abstract]    
Cash and due from banks 0 0
Federal funds sold 0 0
Certificates of deposit investments 0 0
Available-for-sale securities 2,701,000 1,652,000
Held-to-maturity Securities, Fair Value 0 0
Loans held for sale 0 0
Loans net of allowance for loan losses 1,842,343,000 1,795,764,000
Interest receivable 0 0
Federal Reserve Bank stock 0 0
Federal Home Loan Bank stock 0 0
Financial Liabilities [Abstract]    
Deposits 320,367,000 354,919,000
Securities sold under agreements to repurchase 0 0
Interest payable 0 0
Federal Home Loan Bank borrowings 0 0
Other borrowings 0 0
Junior subordinated debentures $ 0 $ 0
Trust preferred securities | Significant Unobservable Inputs (Level 3) | Discounted Cash Flow [Member]    
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]    
Discount rate (in hundredths) 13.30% 13.60%
Constant prepayment rate (in hundredths) [1] 1.30% 1.30%
Cumulative projected prepayments (in hundredths) 21.90% 22.40%
Probability of default (in hundredths) 0.60% 0.50%
Loss severity (in hundredths) 97.70% 97.60%
Projected cures given deferral (in hundredths) 0.00% 0.00%
Impaired loans (collateral dependent) | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring $ 6,793,000 $ 6,938,000
Impaired loans (collateral dependent) | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 0 0
Impaired loans (collateral dependent) | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring $ 0 $ 0
Impaired loans (collateral dependent) | Significant Unobservable Inputs (Level 3) | Minimum [Member] | Third Party Valuations [Member]    
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]    
Discount to reflect realizable value 0.00% 0.00%
Impaired loans (collateral dependent) | Significant Unobservable Inputs (Level 3) | Maximum [Member] | Third Party Valuations [Member]    
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]    
Discount to reflect realizable value 40.00% 40.00%
Impaired loans (collateral dependent) | Significant Unobservable Inputs (Level 3) | Weighted Average [Member] | Third Party Valuations [Member]    
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]    
Discount to reflect realizable value 20.00% 20.00%
Impaired loans (collateral dependent) | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring $ 6,793,000 $ 6,938,000
Assets Held-for-sale [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 307,000 173,000
Assets Held-for-sale [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 0 0
Assets Held-for-sale [Member] | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring $ 0 $ 0
Assets Held-for-sale [Member] | Significant Unobservable Inputs (Level 3) | Minimum [Member] | Third Party Valuations [Member]    
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]    
Discount to reflect realizable value less estimated selling costs (in hundredths) 0.00% 0.00%
Assets Held-for-sale [Member] | Significant Unobservable Inputs (Level 3) | Maximum [Member] | Third Party Valuations [Member]    
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]    
Discount to reflect realizable value less estimated selling costs (in hundredths) 40.00% 40.00%
Assets Held-for-sale [Member] | Significant Unobservable Inputs (Level 3) | Weighted Average [Member] | Third Party Valuations [Member]    
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]    
Discount to reflect realizable value less estimated selling costs (in hundredths) 35.00% 35.00%
Assets Held-for-sale [Member] | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring $ 307,000 $ 173,000
[1] Every five years