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Loans receivable - Changes in the Allowance for Losses on Loans Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period $ 53,107 $ 57,332 $ 55,214 $ 56,795
Current period provision 3,302 6,982 14,436 16,540
Charge-offs (5,274) (10,399) (21,485) (22,483)
Recoveries 1,724 2,060 4,694 5,123
Balance at the end of the period 52,859 55,975 52,859 55,975
Originated        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 48,429 51,138 51,751 50,572
Current period provision 2,089 8,504 9,374 17,395
Charge-offs (4,639) (10,098) (17,302) (21,007)
Recoveries 1,538 1,929 3,594 4,513
Balance at the end of the period 47,417 51,473 47,417 51,473
Originated | Personal Banking        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 17,665 19,610 18,318 20,339
Current period provision 2,337 3,726 6,782 9,890
Charge-offs (3,260) (4,364) (9,875) (13,252)
Recoveries 731 1,077 2,248 3,072
Balance at the end of the period 17,473 20,049 17,473 20,049
Originated | Personal Banking | Residential mortgage loans        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 3,909 3,657 4,054 3,824
Current period provision (1,361) 491 (991) 678
Charge-offs (109) (204) (847) (710)
Recoveries 68 200 291 352
Balance at the end of the period 2,507 4,144 2,507 4,144
Originated | Personal Banking | Home equity loans        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 2,990 3,839 3,184 4,072
Current period provision (81) (351) 36 (164)
Charge-offs (176) (323) (536) (866)
Recoveries 58 69 107 192
Balance at the end of the period 2,791 3,234 2,791 3,234
Originated | Personal Banking | Consumer finance loans        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 266 2,354 676 3,968
Current period provision (141) (437) (561) (469)
Charge-offs (59) (445) (296) (2,484)
Recoveries 74 178 321 635
Balance at the end of the period 140 1,650 140 1,650
Originated | Personal Banking | Consumer loans        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 10,500 9,760 10,404 8,475
Current period provision 3,920 4,023 8,298 9,845
Charge-offs (2,916) (3,392) (8,196) (9,192)
Recoveries 531 630 1,529 1,893
Balance at the end of the period 12,035 11,021 12,035 11,021
Originated | Commercial Banking        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 30,764 31,528 33,433 30,233
Current period provision (248) 4,778 2,592 7,505
Charge-offs (1,379) (5,734) (7,427) (7,755)
Recoveries 807 852 1,346 1,441
Balance at the end of the period 29,944 31,424 29,944 31,424
Originated | Commercial Banking | Commercial real estate loans        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 20,962 21,019 26,379 19,911
Current period provision (1,206) 8,723 (2,177) 10,417
Charge-offs (261) (4,820) (4,978) (5,702)
Recoveries 720 772 991 1,068
Balance at the end of the period 20,215 25,694 20,215 25,694
Originated | Commercial Banking | Commercial loans        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 9,802 10,509 7,054 10,322
Current period provision 958 (3,945) 4,769 (2,912)
Charge-offs (1,118) (914) (2,449) (2,053)
Recoveries 87 80 355 373
Balance at the end of the period 9,729 5,730 9,729 5,730
Acquired        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 4,678 6,194 3,463 6,223
Current period provision 1,213 (1,522) 5,062 (855)
Charge-offs (635) (301) (4,183) (1,476)
Recoveries 186 131 1,100 610
Balance at the end of the period 5,442 4,502 5,442 4,502
Acquired | Personal Banking        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 959 1,747 850 1,783
Current period provision 324 (691) 430 (316)
Charge-offs (474) (191) (742) (881)
Recoveries 132 89 403 368
Balance at the end of the period 941 954 941 954
Acquired | Personal Banking | Residential mortgage loans        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 104 170 83 131
Current period provision 41 (70) 50 (38)
Charge-offs (81) (10) (97) (94)
Recoveries 28 12 56 103
Balance at the end of the period 92 102 92 102
Acquired | Personal Banking | Home equity loans        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 344 662 348 762
Current period provision 220 (173) 249 85
Charge-offs (290) (103) (472) (578)
Recoveries 21 22 170 139
Balance at the end of the period 295 408 295 408
Acquired | Personal Banking | Consumer loans        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 511 915 419 890
Current period provision 63 (448) 131 (363)
Charge-offs (103) (78) (173) (209)
Recoveries 83 55 177 126
Balance at the end of the period 554 444 554 444
Acquired | Commercial Banking        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 3,719   2,613 4,440
Current period provision 889   4,632 (539)
Charge-offs (161)   (3,441) (595)
Recoveries 54   697 242
Balance at the end of the period 4,501 3,548 4,501 3,548
Acquired | Commercial Banking | Residential mortgage loans        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period   3,422    
Current period provision   (532)    
Charge-offs   (39)    
Recoveries   25    
Balance at the end of the period   2,876   2,876
Acquired | Commercial Banking | Home equity loans        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period   1,025    
Current period provision   (299)    
Charge-offs   (71)    
Recoveries   17    
Balance at the end of the period   672   672
Acquired | Commercial Banking | Consumer loans        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period   4,447    
Current period provision   (831)    
Charge-offs   (110)    
Recoveries   42    
Balance at the end of the period   3,548   3,548
Acquired | Commercial Banking | Commercial real estate loans        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 2,571   1,996 3,549
Current period provision 1,155   1,432 (688)
Charge-offs (128)   (382) (147)
Recoveries 24   576 162
Balance at the end of the period 3,622 2,876 3,622 2,876
Acquired | Commercial Banking | Commercial loans        
Changes in allowance for losses on allocated loans receivable        
Balance at the beginning of the period 1,148   617 891
Current period provision (266)   3,200 149
Charge-offs (33)   (3,059) (448)
Recoveries 30   121 80
Balance at the end of the period $ 879 $ 672 $ 879 $ 672