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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Junior subordinated debentures $ 49,814   $ 49,814 $ 43,136
Notional amount 1,556,801   1,556,801 1,481,109
Short-term Debt, Total 996,500   996,500 1,021,500
Amount reclassified from accumulated other comprehensive loss to interest expense 2,600 $ 200    
Amount to be reclassified from the accumulated comprehensive income (loss) into earnings     10,500  
Derivative instruments (35,522)   (35,522) (59,668)
Customer [Member]        
Derivative instruments 115,700   115,700 62,800
Bank [Member]        
Derivative instruments 115,700   115,700 62,800
Customer and Bank [Member]        
Derivative instruments 231,400   231,400 125,600
Not Designated as Hedging Instrument [Member]        
Notional amount 249,400   249,400 143,600
Designated as Hedging Instrument [Member]        
Notional amount 310,900   310,900 316,100
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Notional amount 996,500   996,500 1,021,500
Interest Rate Swap [Member]        
Notional amount 310,900   310,900 316,100
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]        
Notional amount 133,681   133,681 80,779
Derivative instruments (7,497)   (7,497) (6,998)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Notional amount 641,500   641,500 1,021,500
Derivative instruments (17,165)   (17,165) (25,300)
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