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Loans Receivable - Composition of Acquired Impaired Loans by Portfolio Segment and by Class of Financing Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Composition of impaired loans by portfolio segment and by class of financing receivable    
Carrying value   $ 105,993
Average recorded investment in impaired loans   88,643
Interest income recognized $ 217 3,070
Personal Banking    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Carrying value   33,918
Average recorded investment in impaired loans   32,180
Interest income recognized   1,235
Personal Banking | Residential mortgage loans    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Carrying value   21,293
Average recorded investment in impaired loans   19,767
Interest income recognized   688
Personal Banking | Home equity loans    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Carrying value   8,399
Average recorded investment in impaired loans   8,571
Interest income recognized   368
Personal Banking | Consumer loans    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Carrying value   4,226
Average recorded investment in impaired loans   3,842
Interest income recognized   179
Commercial Banking    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Carrying value   72,075
Average recorded investment in impaired loans   56,463
Interest income recognized   1,835
Commercial Banking | Commercial real estate loans    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Carrying value   46,126
Average recorded investment in impaired loans   46,284
Interest income recognized   1,490
Commercial Banking | Commercial loans    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Carrying value   25,949
Average recorded investment in impaired loans   10,179
Interest income recognized   345
Acquired loans evaluated individually for future credit losses    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Carrying value   4,975
Outstanding principal balance   7,187
Related impairment reserve   40
Average recorded investment in impaired loans   5,332
Interest income recognized   551
Acquired loans evaluated individually for future credit losses | Personal Banking    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Carrying value   1,464
Outstanding principal balance   2,835
Related impairment reserve   33
Average recorded investment in impaired loans   1,745
Interest income recognized   273
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    
Carrying value   742
Outstanding principal balance   1,232
Related impairment reserve   7
Average recorded investment in impaired loans   866
Interest income recognized   147
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    
Carrying value   715
Outstanding principal balance   1,569
Related impairment reserve   25
Average recorded investment in impaired loans   861
Interest income recognized   114
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    
Carrying value   7
Outstanding principal balance   34
Related impairment reserve   1
Average recorded investment in impaired loans   18
Interest income recognized   12
Acquired loans evaluated individually for future credit losses | Commercial Banking    
Composition of impaired loans by portfolio segment and by class of financing receivable    
Carrying value   3,511
Outstanding principal balance   4,352
Related impairment reserve   7
Average recorded investment in impaired loans   3,587
Interest income recognized   278
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    
Carrying value   3,433
Outstanding principal balance   4,268
Related impairment reserve   6
Average recorded investment in impaired loans   3,509
Interest income recognized   273
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    
Carrying value   78
Outstanding principal balance   84
Related impairment reserve   1
Average recorded investment in impaired loans   78
Interest income recognized   $ 5