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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
security
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
security
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Derivatives, Fair Value          
Interest rate floor and swaps $ 14,816   $ 14,816   $ 9,870
Liability Derivatives 13,985   13,985   8,818
Posted collateral 11,220   11,220    
Net Amounts of Assets presented in the Balance Sheet 13,985   13,985   8,818
Interest expense          
Derivatives, Fair Value          
Amount of gain or (loss) reclassified as a increase to interest income (expense)       $ (48)  
Interest income          
Derivatives, Fair Value          
Amount of gain or (loss) reclassified as a increase to interest income (expense) 109 $ 150 256 $ 300  
Interest Rate Floor          
Derivatives, Fair Value          
Interest rate floor and swaps 97   97   844
Interest Rate Swaps          
Derivatives, Fair Value          
Interest rate floor and swaps 14,720   14,720   9,026
Credit-risk contract          
Derivatives, Fair Value          
Posted collateral 7,830   7,830    
Net Amounts of Assets presented in the Balance Sheet 3,402   3,402   5,600
Derivatives designated as hedging instruments          
Derivatives, Fair Value          
Interest rate floor and swaps 97   97   844
Derivatives designated as hedging instruments | Interest Rate Floor          
Derivatives, Fair Value          
Notional amount 25,000   25,000    
Derivatives designated as hedging instruments | Interest Rate Floor | Other Assets.          
Derivatives, Fair Value          
Interest rate floor and swaps 97   97   844
Derivatives not designated as hedging instruments          
Derivatives, Fair Value          
Interest rate floor and swaps 14,720   14,720   9,026
Liability Derivatives $ 13,985   $ 13,985   8,811
Derivatives not designated as hedging instruments | Interest Rate Swaps          
Derivatives, Fair Value          
Number of instruments held | security 89   89    
Notional amount $ 418,159   $ 418,159   392,677
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Assets.          
Derivatives, Fair Value          
Interest rate floor and swaps 14,720   14,720   9,026
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Liabilities.          
Derivatives, Fair Value          
Liability Derivatives $ 13,985   13,985   $ 8,811
Cash Flow Hedge | Interest income          
Derivatives, Fair Value          
Amount of gain or (loss) reclassified as a increase to interest income (expense)     $ 41