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Investment Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Securities Available for Sale, Gross Unrealized Losses      
Less Than Twelve Months $ 2,052 $ 3,186 $ 324
Twelve Months or More 845 1,353 2,611
Securities Available for Sale, Fair Value      
Less Than Twelve Months 666,584 503,728 66,450
Twelve Months or More 68,994 141,982 337,108
Government-sponsored entities debt      
Securities Available for Sale, Gross Unrealized Losses      
Twelve Months or More     8
Securities Available for Sale, Fair Value      
Twelve Months or More     5,742
U.S. Treasuries      
Securities Available for Sale, Gross Unrealized Losses      
Less Than Twelve Months 1    
Securities Available for Sale, Fair Value      
Less Than Twelve Months 199,987    
State and municipal obligations      
Securities Available for Sale, Gross Unrealized Losses      
Less Than Twelve Months 565 764  
Twelve Months or More     1
Securities Available for Sale, Fair Value      
Less Than Twelve Months 97,363 42,070 1,490
Twelve Months or More     1,153
Mortgage-backed securities      
Securities Available for Sale, Gross Unrealized Losses      
Less Than Twelve Months 1,486 2,422 324
Twelve Months or More 845 1,353 2,602
Securities Available for Sale, Fair Value      
Less Than Twelve Months 369,234 461,658 64,960
Twelve Months or More $ 68,994 $ 141,982 $ 330,213