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Investment Securities - Reconciliation (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 939,160 $ 985,541
Gross Unrealized Gains 14,660 3,285
Gross Unrealized Losses (1,508) (12,731)
Fair Value 952,312 976,095
U.S. Treasury and U.S. Government-sponsored agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 104,709 101,595
Gross Unrealized Gains 598 155
Gross Unrealized Losses (84) (147)
Fair Value 105,223 101,603
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 128,183 158,461
Gross Unrealized Gains 4,933 1,209
Gross Unrealized Losses (102) (806)
Fair Value 133,014 158,864
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 336,929 337,295
Gross Unrealized Gains 3,184 426
Gross Unrealized Losses (505) (6,119)
Fair Value 339,608 331,602
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 322,169 338,250
Gross Unrealized Gains 5,575 1,035
Gross Unrealized Losses (649) (5,524)
Fair Value 327,095 333,761
Corporate obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 23,893 25,662
Gross Unrealized Gains 316 36
Gross Unrealized Losses (15) (135)
Fair Value 24,194 25,563
Other Security Investments    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 23,277 24,278
Gross Unrealized Gains 54 424
Gross Unrealized Losses (153) 0
Fair Value $ 23,178 $ 24,702