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Fair Value of Financial Instruments (Fair Values of Financial Assets and Liabilities on Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Values of financial Assets and Liabilities on Balance Sheets        
Held-to-maturity investment securities, at amortized cost (fair value of $32,541 at December 31, 2019 and $36,963 at December 31, 2018) $ 31,747 $ 36,961    
Held-to-maturity securities, fair value 32,541 36,963    
Trade and Loans Receivables Held-for-sale, Net, Not Part of Disposal Group 6,499 5,470    
Bank owned life insurance 69,722 68,934    
Servicing rights (b) 2,742 2,655 $ 2,305 $ 2,305
Level 2        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Held-to-maturity securities, fair value 32,541 36,963    
Other investment securities 42,409 42,708    
Level 2 | Recurring Basis        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure 27,235 29,367    
FRB stock 13,310 12,294    
Loans Held-for-sale, Fair Value Disclosure 6,553 5,492    
States and political subdivisions        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Held-to-maturity securities, fair value 4,791 4,896    
States and political subdivisions | Level 2        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Held-to-maturity securities, fair value 4,791 4,896    
Residential mortgage-backed securities        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Held-to-maturity securities, fair value 21,569 28,603    
Residential mortgage-backed securities | Level 2        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Held-to-maturity securities, fair value 21,569 28,603    
Commercial mortgage-backed securities        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Held-to-maturity securities, fair value 6,181 3,464    
Commercial mortgage-backed securities | Level 2        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Held-to-maturity securities, fair value 6,181 3,464    
Nonqualified Plan [Member] | Recurring Basis        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Other investment securities 1,499 987    
FHLMC Stock [Member] | Recurring Basis        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Other investment securities 365      
FHLMC Stock [Member] | Level 2 | Recurring Basis        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Other investment securities   60    
Reported Value Measurement [Member]        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Cash and Cash Equivalents, Fair Value Disclosure 115,193 77,612    
Held-to-maturity investment securities, at amortized cost (fair value of $32,541 at December 31, 2019 and $36,963 at December 31, 2018) 31,747 36,961    
FHLB stock 27,235 29,367    
FRB stock 13,310 12,294    
Other investment securities 42,409 42,708    
Net loans 2,851,969 2,708,583    
Servicing rights (b) 2,742 2,655    
Deposits 3,291,412 2,955,465    
Short-term borrowings 316,977 356,198    
Long-term borrowings 83,123 109,644    
Reported Value Measurement [Member] | Nonqualified Plan [Member]        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Other investment securities 1,499 987    
Reported Value Measurement [Member] | Other [Member]        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Other investment securities 365 60    
Reported Value Measurement [Member] | States and political subdivisions        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Held-to-maturity investment securities, at amortized cost (fair value of $32,541 at December 31, 2019 and $36,963 at December 31, 2018) 4,346 4,403    
Reported Value Measurement [Member] | Residential mortgage-backed securities        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Held-to-maturity investment securities, at amortized cost (fair value of $32,541 at December 31, 2019 and $36,963 at December 31, 2018) 21,494 29,044    
Reported Value Measurement [Member] | Commercial mortgage-backed securities        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Held-to-maturity investment securities, at amortized cost (fair value of $32,541 at December 31, 2019 and $36,963 at December 31, 2018) 5,907 3,514    
Estimate of Fair Value Measurement [Member]        
Fair Values of financial Assets and Liabilities on Balance Sheets        
Cash and Cash Equivalents, Fair Value Disclosure 115,193 77,612    
Net loans 3,147,190 2,907,537    
Servicing rights (b) 3,881 4,568    
Deposits 3,292,950 2,953,452    
Short-term borrowings 317,973 349,994    
Long-term borrowings $ 82,701 $ 107,696