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Loans Receivable - Composition of Impaired Loans by Portfolio Segment and Class of Financing Receivable (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Jan. 01, 2020
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans $ 76,628,000 $ 68,870,000 $ 68,870,000
Nonaccrual loans with no allowance 8,803,000    
Loans 90 days past due and accruing 31,000 147,000  
Amortized cost basis of collateral-dependent loans 43,752,000    
Total impaired loans   105,993,000  
Average recorded investment in impaired loans   88,643,000  
Interest income recognized on impaired loans 217,000 3,070,000  
Personal Banking      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans 22,924,000 25,447,000 25,447,000
Nonaccrual loans with no allowance 0    
Loans 90 days past due and accruing 31,000    
Amortized cost basis of collateral-dependent loans 8,345,000    
Total impaired loans   33,918,000  
Average recorded investment in impaired loans   32,180,000  
Interest income recognized on impaired loans   1,235,000  
Personal Banking | Residential mortgage loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans 11,651,000 14,476,000 14,476,000
Nonaccrual loans with no allowance 0    
Loans 90 days past due and accruing 0    
Amortized cost basis of collateral-dependent loans 6,677,000    
Total impaired loans   21,293,000  
Average recorded investment in impaired loans   19,767,000  
Interest income recognized on impaired loans   688,000  
Personal Banking | Home equity loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans 7,106,000 6,745,000 6,745,000
Nonaccrual loans with no allowance 0    
Loans 90 days past due and accruing 31,000    
Amortized cost basis of collateral-dependent loans 99,000    
Total impaired loans   8,399,000  
Average recorded investment in impaired loans   8,571,000  
Interest income recognized on impaired loans   368,000  
Personal Banking | Vehicle loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans 3,231,000   3,147,000
Nonaccrual loans with no allowance 0    
Loans 90 days past due and accruing 0    
Amortized cost basis of collateral-dependent loans 1,569,000    
Personal Banking | Consumer loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans 936,000 4,226,000 1,079,000
Nonaccrual loans with no allowance 0    
Loans 90 days past due and accruing 0    
Amortized cost basis of collateral-dependent loans 0    
Total impaired loans   4,226,000  
Average recorded investment in impaired loans   3,842,000  
Interest income recognized on impaired loans   179,000  
Commercial Banking      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans 53,704,000 43,423,000 43,423,000
Nonaccrual loans with no allowance 8,803,000    
Loans 90 days past due and accruing 0    
Amortized cost basis of collateral-dependent loans 35,407,000    
Total impaired loans   72,075,000  
Average recorded investment in impaired loans   56,463,000  
Interest income recognized on impaired loans   1,835,000  
Commercial Banking | Commercial real estate loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans 22,730,000 34,864,000 18,832,000
Nonaccrual loans with no allowance 3,654,000    
Loans 90 days past due and accruing 0    
Amortized cost basis of collateral-dependent loans 13,922,000    
Total impaired loans   46,126,000  
Average recorded investment in impaired loans   46,284,000  
Interest income recognized on impaired loans   1,490,000  
Commercial Banking | Commercial real estate loans - owner occupied      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans 12,136,000   16,032,000
Nonaccrual loans with no allowance 3,751,000    
Amortized cost basis of collateral-dependent loans 5,841,000    
Commercial Banking | Commercial loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans 18,838,000 8,559,000 $ 8,559,000
Nonaccrual loans with no allowance 1,398,000    
Loans 90 days past due and accruing 0    
Amortized cost basis of collateral-dependent loans 15,644,000    
Total impaired loans   25,949,000  
Average recorded investment in impaired loans   10,179,000  
Interest income recognized on impaired loans   345,000  
90 days or greater delinquent      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   51,680,000  
90 days or greater delinquent | Personal Banking      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   21,927,000  
90 days or greater delinquent | Personal Banking | Residential mortgage loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   12,682,000  
90 days or greater delinquent | Personal Banking | Home equity loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   5,635,000  
90 days or greater delinquent | Personal Banking | Consumer loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   3,610,000  
90 days or greater delinquent | Commercial Banking      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   29,753,000  
90 days or greater delinquent | Commercial Banking | Commercial real estate loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   25,014,000  
90 days or greater delinquent | Commercial Banking | Commercial loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   4,739,000  
Less than 90 days delinquent      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   17,190,000  
Loans less than 90 days delinquent reviewed for impairment   16,849,000  
TDRs less than 90 days delinquent not included elsewhere   20,274,000  
Less than 90 days delinquent | Personal Banking      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   3,520,000  
Loans less than 90 days delinquent reviewed for impairment   0  
TDRs less than 90 days delinquent not included elsewhere   8,471,000  
Less than 90 days delinquent | Personal Banking | Residential mortgage loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   1,794,000  
Loans less than 90 days delinquent reviewed for impairment   0  
TDRs less than 90 days delinquent not included elsewhere   6,817,000  
Less than 90 days delinquent | Personal Banking | Home equity loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   1,110,000  
Loans less than 90 days delinquent reviewed for impairment   0  
TDRs less than 90 days delinquent not included elsewhere   1,654,000  
Less than 90 days delinquent | Personal Banking | Consumer loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   616,000  
Loans less than 90 days delinquent reviewed for impairment   0  
TDRs less than 90 days delinquent not included elsewhere   0  
Less than 90 days delinquent | Commercial Banking      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   13,670,000  
Loans less than 90 days delinquent reviewed for impairment   16,849,000  
TDRs less than 90 days delinquent not included elsewhere   11,803,000  
Less than 90 days delinquent | Commercial Banking | Commercial real estate loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   9,850,000  
Loans less than 90 days delinquent reviewed for impairment   933,000  
TDRs less than 90 days delinquent not included elsewhere   10,329,000  
Less than 90 days delinquent | Commercial Banking | Commercial loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Nonaccrual loans   3,820,000  
Loans less than 90 days delinquent reviewed for impairment   15,916,000  
TDRs less than 90 days delinquent not included elsewhere   1,474,000  
Real estate      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 30,466,000    
Real estate | Personal Banking      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 6,776,000    
Real estate | Personal Banking | Residential mortgage loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 6,677,000    
Real estate | Personal Banking | Home equity loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 99,000    
Real estate | Personal Banking | Vehicle loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Real estate | Personal Banking | Consumer loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Real estate | Commercial Banking      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 23,690,000    
Real estate | Commercial Banking | Commercial real estate loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 13,922,000    
Real estate | Commercial Banking | Commercial real estate loans - owner occupied      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 5,841,000    
Real estate | Commercial Banking | Commercial loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 3,927,000    
Equipment      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 11,717,000    
Equipment | Personal Banking      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Equipment | Personal Banking | Residential mortgage loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Equipment | Personal Banking | Home equity loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Equipment | Personal Banking | Vehicle loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Equipment | Personal Banking | Consumer loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Equipment | Commercial Banking      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 11,717,000    
Equipment | Commercial Banking | Commercial real estate loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Equipment | Commercial Banking | Commercial real estate loans - owner occupied      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Equipment | Commercial Banking | Commercial loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 11,717,000    
Other      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 1,569,000    
Other | Personal Banking      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 1,569,000    
Other | Personal Banking | Residential mortgage loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Other | Personal Banking | Home equity loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Other | Personal Banking | Vehicle loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 1,569,000    
Other | Personal Banking | Consumer loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Other | Commercial Banking      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Other | Commercial Banking | Commercial real estate loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Other | Commercial Banking | Commercial real estate loans - owner occupied      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans 0    
Other | Commercial Banking | Commercial loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Amortized cost basis of collateral-dependent loans $ 0    
Acquired loans evaluated individually for future credit losses      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Total impaired loans   4,975,000  
Average recorded investment in impaired loans   5,332,000  
Interest income recognized on impaired loans   551,000  
Outstanding principal balance   7,187,000  
Related impairment reserve   40,000  
Acquired loans evaluated individually for future credit losses | Personal Banking      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Total impaired loans   1,464,000  
Average recorded investment in impaired loans   1,745,000  
Interest income recognized on impaired loans   273,000  
Outstanding principal balance   2,835,000  
Related impairment reserve   33,000  
Acquired loans evaluated individually for future credit losses | Personal Banking | Residential mortgage loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Total impaired loans   742,000  
Average recorded investment in impaired loans   866,000  
Interest income recognized on impaired loans   147,000  
Outstanding principal balance   1,232,000  
Related impairment reserve   7,000  
Acquired loans evaluated individually for future credit losses | Personal Banking | Home equity loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Total impaired loans   715,000  
Average recorded investment in impaired loans   861,000  
Interest income recognized on impaired loans   114,000  
Outstanding principal balance   1,569,000  
Related impairment reserve   25,000  
Acquired loans evaluated individually for future credit losses | Personal Banking | Consumer loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Total impaired loans   7,000  
Average recorded investment in impaired loans   18,000  
Interest income recognized on impaired loans   12,000  
Outstanding principal balance   34,000  
Related impairment reserve   1,000  
Acquired loans evaluated individually for future credit losses | Commercial Banking      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Total impaired loans   3,511,000  
Average recorded investment in impaired loans   3,587,000  
Interest income recognized on impaired loans   278,000  
Outstanding principal balance   4,352,000  
Related impairment reserve   7,000  
Acquired loans evaluated individually for future credit losses | Commercial Banking | Commercial real estate loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Total impaired loans   3,433,000  
Average recorded investment in impaired loans   3,509,000  
Interest income recognized on impaired loans   273,000  
Outstanding principal balance   4,268,000  
Related impairment reserve   6,000  
Acquired loans evaluated individually for future credit losses | Commercial Banking | Commercial loans      
Composition of impaired loans by portfolio segment and by class of financing receivable      
Total impaired loans   78,000  
Average recorded investment in impaired loans   78,000  
Interest income recognized on impaired loans   5,000  
Outstanding principal balance   84,000  
Related impairment reserve   $ 1,000