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Allowance for loan losses - Troubled debt restructurings loan count by type of modification (Details) - loans
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Troubled Debt Restructuring    
Reduction In Interest Rate 1,254 2,059
Extension of Maturity Date 269 259
Combination Interest Rate Reduction Maturity Date Extension 690 383
Other Modifications 198 492
Commercial multi-family    
Troubled Debt Restructuring    
Reduction In Interest Rate 0 0
Extension of Maturity Date 3 2
Combination Interest Rate Reduction Maturity Date Extension 0 0
Other Modifications 0 0
CRE non-owner occupied    
Troubled Debt Restructuring    
Reduction In Interest Rate 0 3
Extension of Maturity Date 13 17
Combination Interest Rate Reduction Maturity Date Extension 0 0
Other Modifications 0 0
CRE owner occupied    
Troubled Debt Restructuring    
Reduction In Interest Rate 1 4
Extension of Maturity Date 29 64
Combination Interest Rate Reduction Maturity Date Extension 0 0
Other Modifications 0 0
Commercial and industrial    
Troubled Debt Restructuring    
Reduction In Interest Rate 2 6
Extension of Maturity Date 67 87
Combination Interest Rate Reduction Maturity Date Extension 0 0
Other Modifications 0 0
Construction    
Troubled Debt Restructuring    
Reduction In Interest Rate   1
Extension of Maturity Date   0
Combination Interest Rate Reduction Maturity Date Extension   0
Other Modifications   0
Mortgages    
Troubled Debt Restructuring    
Reduction In Interest Rate 37 85
Extension of Maturity Date 130 49
Combination Interest Rate Reduction Maturity Date Extension 672 359
Other Modifications 6 57
Leasing    
Troubled Debt Restructuring    
Reduction In Interest Rate 0 0
Extension of Maturity Date 1 0
Combination Interest Rate Reduction Maturity Date Extension 2 4
Other Modifications 0 0
Credit cards    
Troubled Debt Restructuring    
Reduction In Interest Rate 515 579
Extension of Maturity Date 0 0
Combination Interest Rate Reduction Maturity Date Extension 2 4
Other Modifications 189 432
Home equity lines of credit    
Troubled Debt Restructuring    
Reduction In Interest Rate 0 0
Extension of Maturity Date 16 27
Combination Interest Rate Reduction Maturity Date Extension 12 11
Other Modifications 0 1
Personal Loan    
Troubled Debt Restructuring    
Reduction In Interest Rate 668 1,356
Extension of Maturity Date 4 6
Combination Interest Rate Reduction Maturity Date Extension 0 0
Other Modifications 3 2
Auto Loan    
Troubled Debt Restructuring    
Reduction In Interest Rate 0 0
Extension of Maturity Date 6 7
Combination Interest Rate Reduction Maturity Date Extension 2 3
Other Modifications 0 0
Other    
Troubled Debt Restructuring    
Reduction In Interest Rate 31 25
Extension of Maturity Date 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 2
Other Modifications 0 0