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Investment Securities - Amortized cost and fair value by contractual maturity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Amortized Cost      
Due after five years through ten years $ 103,514,000 $ 103,514,000  
Due after ten years 1,085,751,000 1,085,751,000  
Total 1,189,265,000 1,189,265,000 $ 955,542,000
Fair Value      
Due after five years through ten years 101,198,000 101,198,000  
Due after ten years 1,067,194,000 1,067,194,000  
Fair Value 1,168,392,000 1,168,392,000 957,183,000
Amortized Cost      
Due in one year or less 10,578,000 10,578,000  
Due after one year through five years 90,138,000 90,138,000  
Due after five years through ten years 680,007,000 680,007,000  
Due after ten years 3,556,572,000 3,556,572,000  
Amortized Cost 4,337,295,000 4,337,295,000 3,268,037,000
Fair Value      
Due in one year or less 10,642,000 10,642,000  
Due after one year through five years 92,882,000 92,882,000  
Due after five years through ten years 691,269,000 691,269,000  
Due after ten years 3,574,366,000 3,574,366,000  
Fair Value 4,369,159,000 4,369,159,000 $ 3,330,672,000
Information with respect to sales of available-for-sale securities      
Sale proceeds   15,405,000  
Gross realized gains $ 69,000    
Gross realized losses   $ 33,000