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Investment Securities - Amortized cost and fair value by contractual maturity (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jul. 07, 2020
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amortized Cost          
Due after five years through ten years     $ 88,735,000    
Due after ten years     866,807,000    
Total     955,542,000    
Fair Value          
Due after five years through ten years     89,007,000    
Due after ten years     868,176,000    
Fair Value     957,183,000 $ 0  
Amortized Cost          
Due in one year or less     9,669,000    
Due after one year through five years     80,846,000    
Due after five years through ten years     525,547,000    
Due after ten years     2,651,975,000    
Amortized Cost     3,268,037,000 1,940,763,000  
Fair Value          
Due in one year or less     9,698,000    
Due after one year through five years     83,586,000    
Due after five years through ten years     539,905,000    
Due after ten years     2,697,483,000    
Fair Value     3,330,672,000 1,956,047,000  
Information with respect to sales of available-for-sale securities          
Sale proceeds     100,754,000 242,733,000 $ 73,054,000
Gross realized gains     662,000 6,030,000 31,000
Gross realized losses     612,000 3,319,000 686,000
Net realized gain $ 338,000   50,000 2,711,000 (655,000)
Information with respect to sales of held-to-maturity          
Proceeds from sales of investment securities held to maturity     $ 0 0 $ 0
VISA Class B Shares          
Information with respect to sales of available-for-sale securities          
Net realized gain   $ 5,400,000   $ 2,700,000