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Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Narrative) (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
contracts
Dec. 31, 2017
USD ($)
contracts
Dec. 31, 2016
USD ($)
contracts
Financing Receivable, Allowance for Credit Losses [Line Items]      
Average recorded investment $ 133,481,000 $ 115,261,000 $ 105,400,000
Interest income recognized on impaired loans 7,347,000 6,298,000 $ 5,500,000
Loans modified in TDRs $ 66,102,000 $ 49,786,000  
Number of loans | contracts 71 21 21
Allowance for loan losses related to impaired loans $ 11,437,000 $ 8,023,000  
Balance of loans $ 29,243,000 $ 24,325,000 $ 12,897,000
Weighted average extension term 48 months 35 months 19 months
Weighted average decrease in stated interest rate 1.72% 4.85% 0.34%
Weighted average interest only payment term 7 months 11 months 7 months
Loan forgiveness $ 8,000 $ 73,000 $ 300,000
Financing Receivable      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Number of loans | contracts 134    
Allowance for loan losses related to impaired loans $ 2,100,000    
Interest income from decrease in impairment 113,000 207,000  
Residential Real Estate | Financing Receivable      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Other real estate owned 4,900,000    
In process other real estate owned $ 14,400,000 $ 9,800,000