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Borrowings - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Short-term advances outstanding from FHLB of boston   $ 100,000,000.0 $ 0
Weighted average interest rate   4.38%  
Repurchase agreement   $ 5,000,000.0 0
Average balance of securities sold under agreements to repurchase   1,200,000  
Borrowings under PPP loan $ 85,400,000 0 0
Percentage of debt instrument interest rate stated 0.35%    
Unused borrowing capacity based upon collateral pledged   $ 639,000,000.0  
Minimum      
Debt Instrument [Line Items]      
Percentage of carrying value, secured blanket lien on qualified collateral   60.00%  
Maximum      
Debt Instrument [Line Items]      
Percentage of carrying value, secured blanket lien on qualified collateral   70.00%  
Investment Securities Commercial Real Estate and Commercial and Industrial Loans | Line of Credit      
Debt Instrument [Line Items]      
Collateral pledged amount   $ 970,100,000 652,300,000
FRB Boston | Investment Securities Commercial Real Estate and Commercial and Industrial Loans      
Debt Instrument [Line Items]      
Line of credit unused borrowing capacity   $ 680,400,000 $ 419,600,000
Subordinated Debt      
Debt Instrument [Line Items]      
Redemption amount $ 10,000,000.0    
Coupon rate 6.00%