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Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Available-for-sale    
Amortized Cost $ 3,359,493 $ 2,521,374
Gross Unrealized Gains 175,026 55,965
Gross Unrealized Losses (569) (2,087)
Fair Value 3,533,950 2,575,252
Held-to-maturity    
Amortized Cost 203,275 224,611
Gross Unrealized Gains 12,608 9,785
Gross Unrealized Losses 0 0
Fair Value 215,883 234,396
U.S. government and federal agency    
Available-for-sale    
Amortized Cost 42,016 20,061
Gross Unrealized Gains 391 48
Gross Unrealized Losses (172) (65)
Fair Value 42,235 20,044
U.S. government sponsored enterprises    
Available-for-sale    
Amortized Cost 10,788 42,724
Gross Unrealized Gains 75 953
Gross Unrealized Losses 0 0
Fair Value 10,863 43,677
State and local governments    
Available-for-sale    
Amortized Cost 1,198,293 679,784
Gross Unrealized Gains 79,406 22,694
Gross Unrealized Losses (147) (80)
Fair Value 1,277,552 702,398
Held-to-maturity    
Amortized Cost 203,275 224,611
Gross Unrealized Gains 12,608 9,785
Gross Unrealized Losses 0 0
Fair Value 215,883 234,396
Corporate bonds    
Available-for-sale    
Amortized Cost 374,193 155,665
Gross Unrealized Gains 14,389 1,938
Gross Unrealized Losses (207) (1)
Fair Value 388,375 157,602
Residential mortgage-backed securities    
Available-for-sale    
Amortized Cost 835,036 731,766
Gross Unrealized Gains 22,648 7,507
Gross Unrealized Losses (43) (549)
Fair Value 857,641 738,724
Commercial mortgage-backed securities    
Available-for-sale    
Amortized Cost 899,167 891,374
Gross Unrealized Gains 58,117 22,825
Gross Unrealized Losses 0 (1,392)
Fair Value $ 957,284 $ 912,807