Commitments and Contingencies (Financial Instrument with Off-balance-sheet Risk) (Details) - USD ($)
$ in Thousands |
Mar. 31, 2020 |
Dec. 31, 2019 |
| Loan commitments |
|
|
| Unadvanced portion of loans and leases |
$ 713,352
|
$ 808,681
|
| Unused lines of credit: |
|
|
| Home equity |
537,313
|
528,251
|
| Other consumer |
25,362
|
25,374
|
| Other commercial |
406
|
380
|
| Unused letters of credit: |
|
|
| Financial standby letters of credit |
11,094
|
10,166
|
| Performance standby letters of credit |
6,107
|
4,652
|
| Commercial and similar letters of credit |
3,823
|
3,823
|
| Commercial real estate |
|
|
| Loan commitments |
|
|
| Commitments to originate loans and leases |
40,933
|
50,034
|
| Commercial |
|
|
| Loan commitments |
|
|
| Commitments to originate loans and leases |
93,724
|
78,058
|
| Residential mortgage |
|
|
| Loan commitments |
|
|
| Commitments to originate loans and leases |
52,930
|
25,998
|
| Receive fixed, pay variable |
|
|
| Unused letters of credit: |
|
|
| Derivatives |
1,231,096
|
1,101,193
|
| Pay fixed, receive variable |
|
|
| Unused letters of credit: |
|
|
| Derivatives |
1,231,096
|
1,101,193
|
| Risk participation-out agreements |
|
|
| Unused letters of credit: |
|
|
| Derivatives |
233,846
|
235,693
|
| Risk participation-in agreements |
|
|
| Unused letters of credit: |
|
|
| Derivatives |
49,279
|
55,281
|
| Foreign exchange contracts | Buys foreign currency, sells U.S. currency |
|
|
| Unused letters of credit: |
|
|
| Derivatives |
1,422
|
1,125
|
| Foreign exchange contracts | Sells foreign currency, buys U.S. currency |
|
|
| Unused letters of credit: |
|
|
| Derivatives |
$ 1,530
|
$ 1,230
|