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Fair Value Disclosures and Reporting, the Fair Value Option and Fair Value Measurements (Carrying Amount and Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Financial Assets:    
Investment securities available for sale $ 528,539 $ 507,582
Carrying Amount [Member]    
Financial Assets:    
Cash and cash equivalents 53,041 48,623
Investment securities available for sale 528,539 507,582
Loans and leases, net held for investment 1,145,888 1,120,773
Collateral dependent impaired loans 1,983 3,829
Loans held-for-sale 0  
Cash surrender value of life insurance policies 43,829 44,140
Other investments 7,945 7,546
Investment in limited partnerships 8,568 6,217
Accrued interest receivable 5,697 5,808
Deposits:    
Noninterest-bearing 433,328 432,251
Interest-bearing 1,052,746 1,032,377
Fed funds purchased and repurchase agreements 14,294 9,405
Short-term borrowings 93,700 75,300
Long-term borrowings 0 2,000
Subordinated debentures 30,928 30,928
Limited partnership capital commitment 3,070 795
Accrued Interest Payable 128 116
Fair Value [Member]    
Financial Assets:    
Cash and cash equivalents 53,041 48,623
Investment securities available for sale 528,539 507,582
Loans and leases, net held for investment 1,172,194 1,136,386
Collateral dependent impaired loans 1,983 3,829
Loans held-for-sale 0  
Cash surrender value of life insurance policies 43,829 44,140
Other investments 7,945 7,546
Investment in limited partnerships 8,568 6,217
Accrued interest receivable 5,697 5,808
Deposits:    
Noninterest-bearing 433,328 432,251
Interest-bearing 929,491 1,032,547
Fed funds purchased and repurchase agreements 14,294 9,405
Short-term borrowings 93,700 75,300
Long-term borrowings 0 2,001
Subordinated debentures 8,847 7,383
Limited partnership capital commitment 3,070 795
Accrued Interest Payable 128 116
Fair Value [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial Assets:    
Cash and cash equivalents 53,041 48,623
Investment securities available for sale 1,127 1,296
Loans and leases, net held for investment 0 0
Collateral dependent impaired loans 0 0
Loans held-for-sale 0  
Cash surrender value of life insurance policies 0 0
Other investments 0 0
Investment in limited partnerships 0 0
Accrued interest receivable 0 0
Deposits:    
Noninterest-bearing 433,328 432,251
Interest-bearing 0 0
Fed funds purchased and repurchase agreements 0 0
Short-term borrowings 0 0
Long-term borrowings 0 0
Subordinated debentures 0 0
Limited partnership capital commitment 0 0
Accrued Interest Payable 0 0
Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial Assets:    
Cash and cash equivalents 0 0
Investment securities available for sale 527,412 506,286
Loans and leases, net held for investment 1,172,194 1,136,386
Collateral dependent impaired loans 1,983 3,829
Loans held-for-sale 0  
Cash surrender value of life insurance policies 43,829 44,140
Other investments 7,945 7,546
Investment in limited partnerships 8,568 6,217
Accrued interest receivable 5,697 5,808
Deposits:    
Noninterest-bearing 0 0
Interest-bearing 929,491 1,032,547
Fed funds purchased and repurchase agreements 14,294 9,405
Short-term borrowings 93,700 75,300
Long-term borrowings 0 2,001
Subordinated debentures 8,847 7,383
Limited partnership capital commitment 3,070 795
Accrued Interest Payable 128 116
Fair Value [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial Assets:    
Cash and cash equivalents 0 0
Investment securities available for sale 0 0
Loans and leases, net held for investment 0 0
Collateral dependent impaired loans 0 0
Loans held-for-sale 0  
Cash surrender value of life insurance policies 0 0
Other investments 0 0
Investment in limited partnerships 0 0
Accrued interest receivable 0 0
Deposits:    
Noninterest-bearing 0 0
Interest-bearing 0 0
Fed funds purchased and repurchase agreements 0 0
Short-term borrowings 0 0
Long-term borrowings 0 0
Subordinated debentures 0 0
Limited partnership capital commitment 0 0
Accrued Interest Payable $ 0 $ 0