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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, 2019
USD ($)
contracts
Dec. 31, 2018
USD ($)
contracts
Dec. 31, 2017
USD ($)
contracts
Financing Receivable, Allowance for Credit Loss [Line Items]      
Average recorded investment in impaired loans $ 151,761,000 $ 133,481,000 $ 115,300,000
Interest income recognized on impaired loans 9,383,000 7,347,000 $ 6,300,000
Loans modified in TDRs $ 63,836,000 $ 66,102,000  
Number of loans (contract) | contracts 176 71 21
Impairment of TDR $ 12,336,000 $ 11,437,000  
Balance of loans $ 53,565,000 $ 29,243,000 $ 24,325,000
Weighted average extension term 18 months 48 months 35 months
Weighted average decrease in stated interest rate (as a percent) 2.18% 1.72% 4.85%
Weighted average interest only payment term 5 months 7 months 11 months
Loan forgiveness $ 0 $ 8,000 $ 73,000
Financing Receivable      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Number of loans (contract) | contracts 255    
Impairment of TDR $ 5,700,000    
Interest income from decrease in impairment 66,000 113,000  
Residential Real Estate | Financing Receivable      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Foreclosed properties included within OREO 1,800,000    
Foreclosure proceedings in process $ 13,500,000 $ 14,400,000