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Derivative Instruments and Hedging Activities- Narrative (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
instrument
Dec. 31, 2014
USD ($)
Dec. 31, 2019
USD ($)
Derivative [Line Items]      
Loans receivable with fixed rates of interest maturity period   10 years  
Loans receivable with fixed rates   $ 29,100,000  
Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Notional amount $ 15,880,000   $ 16,286,000
Derivative liabilities 695,000   235,000
Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Notional amount 612,291,000   312,262,000
Derivative liabilities 1,507,000   209,000
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Notional amount $ 242,000   303,000
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] | Other Liabilities [Member]      
Derivative [Line Items]      
Derivative liabilities $ 13,000   14,000
Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Notional amount $ 393,444,000   270,147,000
Derivative number of instruments held | instrument 58    
Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]      
Derivative [Line Items]      
Derivative liabilities $ 912,000   176,000
Underlying derivative at fair value 912,000    
Cash Flow Hedging [Member] | Interest Rate Swap [Member]      
Derivative [Line Items]      
Notional amount   $ 20,000,000.0  
Derivative fixed interest rate   2.10%  
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months 238,000    
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Notional amount 15,880,000   16,286,000
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]      
Derivative [Line Items]      
Derivative liabilities $ 695,000   $ 235,000
Minimum [Member] | Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative remaining maturity 2 years    
Maximum [Member] | Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative remaining maturity 10 years    
One-Month LIBOR [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Basis points 2.24%    
Customer [Member] | Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Underlying derivative at fair value $ 35,100,000