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Investment Securities - Securities with gross unrealized losses (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Investment Securities    
Number of securities with gross unrealized loss | item 143  
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months $ 3,186 $ 6,042
Twelve Months or More 1,353 19,968
Securities Available for Sale, Fair Value    
Less Than Twelve Months 503,728 456,013
Twelve Months or More 141,982 802,413
Government-sponsored entities debt    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months   100
Twelve Months or More   652
Securities Available for Sale, Fair Value    
Less Than Twelve Months   10,571
Twelve Months or More   32,959
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 764 760
Twelve Months or More   365
Securities Available for Sale, Fair Value    
Less Than Twelve Months 42,070 40,387
Twelve Months or More   14,231
Mortgage-backed securities    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2,422 5,182
Twelve Months or More 1,353 18,951
Securities Available for Sale, Fair Value    
Less Than Twelve Months 461,658 405,055
Twelve Months or More $ 141,982 $ 755,223