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Allowance for loan losses - Troubled debt restructurings loan count by type of modification (Details) - loans
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Troubled Debt Restructuring        
Reduction In Interest Rate 305 659 979 1,673
Extension of Maturity Date 62 61 189 192
Combination Interest Rate Reduction Maturity Date Extension 211 76 510 192
Other Modifications 44 84 167 439
Commercial multi-family        
Troubled Debt Restructuring        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 0 1 1 2
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0
CRE non-owner occupied        
Troubled Debt Restructuring        
Reduction In Interest Rate 0 1 0 3
Extension of Maturity Date 3 3 6 14
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0
CRE owner occupied        
Troubled Debt Restructuring        
Reduction In Interest Rate 0 1 1 4
Extension of Maturity Date 4 12 19 54
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0
Commercial and industrial        
Troubled Debt Restructuring        
Reduction In Interest Rate 2 2 2 6
Extension of Maturity Date 7 25 41 75
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0
Construction        
Troubled Debt Restructuring        
Reduction In Interest Rate   0   1
Extension of Maturity Date   0   0
Combination Interest Rate Reduction Maturity Date Extension   0   0
Other Modifications   0   0
Mortgages        
Troubled Debt Restructuring        
Reduction In Interest Rate 2 28 33 73
Extension of Maturity Date 43 7 98 17
Combination Interest Rate Reduction Maturity Date Extension 207 70 494 173
Other Modifications 3 11 5 56
Leasing        
Troubled Debt Restructuring        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 1 0 1 0
Combination Interest Rate Reduction Maturity Date Extension 1 3 2 4
Other Modifications 0 0 0 0
Credit cards        
Troubled Debt Restructuring        
Reduction In Interest Rate 111 115 394 426
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 1 0 2 3
Other Modifications 41 72 161 382
Home equity lines of credit        
Troubled Debt Restructuring        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 2 8 14 20
Combination Interest Rate Reduction Maturity Date Extension 2 1 11 8
Other Modifications 0 1 0 1
Personal Loan        
Troubled Debt Restructuring        
Reduction In Interest Rate 183 511 527 1,139
Extension of Maturity Date 1 1 4 4
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 1 0
Auto Loan        
Troubled Debt Restructuring        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 1 4 5 6
Combination Interest Rate Reduction Maturity Date Extension 0 1 1 2
Other Modifications 0 0 0 0
Other        
Troubled Debt Restructuring        
Reduction In Interest Rate 7 1 22 21
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 1 0 2
Other Modifications 0 0 0 0