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Securities Securities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]          
Securities pledged as collateral to secure public funds and other deposits or securities sold under agreements to repurchase $ 1,200,000   $ 1,200,000    
Secured borrowing under agreement to repurchase 95,400   95,400    
Accumulated unrealized losses 20,233   20,233   $ 71,731
Fair value of securities 1,124,688   1,124,688   2,748,125
Debt Securities Available-for-sale Sold Amount 149,400   626,100    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 308 $ 8 (4,438) $ 30  
Available-for-sale securities transferred to Held-to-Maturity     0 $ 179,763 $ 179,800
Securities pledged as collateral          
Debt Securities, Available-for-sale [Line Items]          
Secured borrowing under agreement to repurchase $ 95,400   $ 95,400