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Investment Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment securities available for sale        
Amortized cost   $ 1,940,763,000 $ 1,540,650,000  
Gross Unrealized Gains   19,823,000 2,427,000  
Gross Unrealized Losses   (4,539,000) (26,010,000)  
Fair Value   1,956,047,000 1,517,067,000  
Gross realized gains   6,030,000 31,000 $ 1,832,000
Gross realized losses   3,319,000 686,000 411,000
Net realized gain   2,711,000 (655,000) $ 1,421,000
Government-sponsored entities debt        
Investment securities available for sale        
Amortized cost   25,356,000 48,982,000  
Gross Unrealized Gains   585,000 21,000  
Gross Unrealized Losses     (752,000)  
Fair Value   25,941,000 48,251,000  
State and municipal obligations        
Investment securities available for sale        
Amortized cost   204,150,000 200,184,000  
Gross Unrealized Gains   5,029,000 1,709,000  
Gross Unrealized Losses   (764,000) (1,125,000)  
Fair Value   208,415,000 200,768,000  
Mortgage-backed securities        
Investment securities available for sale        
Amortized cost   1,711,257,000 1,291,484,000  
Gross Unrealized Gains   14,209,000 697,000  
Gross Unrealized Losses   (3,775,000) (24,133,000)  
Fair Value   1,721,691,000 $ 1,268,048,000  
VISA Class B Shares        
Investment securities available for sale        
Net realized gain $ 5,400,000 2,700,000    
Mortgage-backed securities issued by private label holdings        
Investment securities available for sale        
Fair Value   $ 0