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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Junior subordinated debentures $ 38,287   $ 38,287   $ 44,384
Notional amount 1,399,269   1,399,269   885,469
Short-term Debt, Total 1,021,500   1,021,500   541,500
Amount reclassified from accumulated other comprehensive loss to interest expense 1,400 $ 400 2,100 $ 1,300  
Amount to be reclassified from the accumulated comprehensive income (loss) into earnings     2,900    
Derivative instruments (69,179)   (69,179)   (17,301)
Customer [Member]          
Derivative instruments 20,600   20,600    
Bank [Member]          
Derivative instruments 20,600   20,600    
Customer and Bank [Member]          
Derivative instruments 41,200   41,200    
Not Designated as Hedging Instrument [Member]          
Notional amount 59,200   59,200   18,000
Designated as Hedging Instrument [Member]          
Notional amount 318,600   318,600   326,000
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]          
Notional amount 1,021,500   1,021,500   541,500
Interest Rate Swap [Member]          
Notional amount 318,600   318,600   326,000
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]          
Notional amount 38,600   38,600   18,000
Derivative instruments (6,990)   (6,990)   (3,534)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]          
Notional amount 1,021,500   1,021,500   541,500
Derivative instruments (28,527)   (28,527)   (8,350)
Floating Rate Junior Subordinated Debentures [Member]          
Amount of hedged item 18,000   18,000   18,000
Junior subordinated debentures $ 61,900   $ 61,900   $ 61,900