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Borrowings (Summary of Short term and Long term Borrowings and Subordinated Debentures) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
FHLBB borrowings $ 25,000  
Securities Sold under Agreements to Repurchase $ 245,868 $ 244,646
FHLBB borrowings    
Debt Instrument [Line Items]    
Weighted Average Rate (as a percent) 1.87% 1.87%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2018 $ 25,000  
2019 10,000  
2020 0  
Customer repurchase agreements    
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2018 245,868  
FHLBB and correspondent bank overnight borrowings    
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2018 $ 0  
Capital lease obligation    
Debt Instrument [Line Items]    
Weighted Average Rate (as a percent) 4.20% 4.06%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2018 $ 89  
2019 96  
2020 106  
2021 115  
2022 123  
Thereafter $ 1,051  
Long-term Debt    
Debt Instrument [Line Items]    
Weighted Average Rate (as a percent) 2.19% 2.03%
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months $ 89  
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2019 10,096  
2020 106  
2021 115  
2022 123  
Thereafter 1,051  
Total long-term borrowings $ 11,580 $ 10,791
Long-term Debt | FHLBB borrowings    
Debt Instrument [Line Items]    
Weighted Average Rate (as a percent) 1.87% 1.87%
Subordinated Debt and Junior Subordinated Debt    
Debt Instrument [Line Items]    
Weighted Average Rate (as a percent) 5.23% 5.24%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
Thereafter $ 59,067  
Total long-term borrowings $ 59,067 $ 58,911
Subordinated Debt | Subordinated debentures    
Debt Instrument [Line Items]    
Weighted Average Rate (as a percent) [1] 5.50% 5.50%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
Thereafter [1] $ 14,634  
Total long-term borrowings [1] 14,634 $ 14,580
Debt Issuance Costs, Net 366 420
Short-term Debt    
Debt Instrument [Line Items]    
Total short-term borrowings $ 270,868 $ 541,796
Weighted Average Rate (as a percent) 1.43% 1.10%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2018 $ 270,868  
Short-term Debt | FHLBB borrowings    
Debt Instrument [Line Items]    
FHLBB borrowings $ 25,000 $ 250,000
Weighted Average Rate (as a percent) 2.71% 1.54%
Short-term Debt | Customer repurchase agreements    
Debt Instrument [Line Items]    
Securities Sold under Agreements to Repurchase $ 245,868 $ 244,646
Short-term Debt | FHLBB and correspondent bank overnight borrowings    
Debt Instrument [Line Items]    
FHLBB and correspondent bank overnight borrowings 0 47,150
Long-term Debt | FHLBB borrowings    
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
Long-term Federal Home Loan Bank Advances 10,000 10,000
Long-term Debt | Capital lease obligation    
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
Capital lease obligation $ 1,580 $ 791
Subsidiary One [Member] | Junior Subordinated Debt    
Debt Instrument [Line Items]    
Weighted Average Rate (as a percent) 5.38% 5.38%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
Thereafter $ 36,083  
Total long-term borrowings $ 36,083 $ 36,083
Subsidiary Two [Member] | Junior Subordinated Debt    
Debt Instrument [Line Items]    
Weighted Average Rate (as a percent) 4.14% 4.14%
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
Thereafter $ 8,350  
Total long-term borrowings $ 8,350 $ 8,248
[1] (1)The outstanding balance of subordinated debentures was presented net of debt issuance costs of $366,000 and $420,000 at December 31, 2018 and 2017, respectively.