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Derivative Instruments and Hedging Activities - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
instrument
Dec. 31, 2014
USD ($)
Dec. 31, 2018
USD ($)
Derivative [Line Items]      
Loans receivable with fixed rates of interest maturity period   10 years  
Loans receivable with fixed rates   $ 29,100  
Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Notional amount $ 16,286   $ 18,422
Derivative liabilities 235   0
Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Notional amount 312,262   167,549
Derivative liabilities 209   242
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Notional amount $ 303   418
Loans receivable with fixed rates of interest maturity period 15 years    
Derivative fixed interest rate 7.43%    
Loans receivable fixed interest rate (percentage) 7.43%    
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | One-Month LIBOR [Member]      
Derivative [Line Items]      
Derivative spread on floating rate 2.24%    
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]      
Derivative [Line Items]      
Derivative liabilities $ 14   20
Interest Rate Swap [Member] | Cash Flow Hedging [Member]      
Derivative [Line Items]      
Notional amount   $ 20,000  
Derivative fixed interest rate   2.10%  
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months 63    
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Notional amount 16,286   17,076
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]      
Derivative [Line Items]      
Derivative liabilities $ 235   0
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Notional amount     1,346
Loans receivable with fixed rates of interest maturity period 10 years    
Derivative fixed interest rate 5.83%    
Loans receivable fixed interest rate (percentage) 5.83%    
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | One-Month LIBOR [Member]      
Derivative [Line Items]      
Derivative spread on floating rate 3.50%    
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]      
Derivative [Line Items]      
Derivative liabilities     0
Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Notional amount $ 270,147   122,410
Derivative number of instruments held | instrument 38    
Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member] | Minimum [Member]      
Derivative [Line Items]      
Derivative remaining maturity 1 year    
Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member] | Maximum [Member]      
Derivative [Line Items]      
Derivative remaining maturity 10 years    
Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]      
Derivative [Line Items]      
Derivative liabilities $ 176   $ 72
Underlying derivative at fair value 8,300    
Paying [Member] | Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Notional amount 225,200    
Receiving [Member] | Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Notional amount $ 44,900