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Investment Securities Debt Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 482,699 $ 491,290
Debt Securities, Gross Unrealized Gains 23,276 13,965
Debt Securities, Gross Unrealized Loss 304 467
Debt securities at fair value 505,671 504,788
Federal agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost [1] 1,000 999
Debt Securities, Gross Unrealized Gains [1] 6 5
Debt Securities, Gross Unrealized Loss [1] 0 0
Debt securities at fair value [1] 1,006 1,004
Residential federal agency MBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost [1] 181,399 190,392
Debt Securities, Gross Unrealized Gains [1] 7,361 2,599
Debt Securities, Gross Unrealized Loss [1] 47 333
Debt securities at fair value [1] 188,713 192,658
Commercial federal agency MBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost [1] 110,441 111,182
Debt Securities, Gross Unrealized Gains [1] 6,372 3,453
Debt Securities, Gross Unrealized Loss [1] 0 0
Debt securities at fair value [1] 116,813 114,635
Taxable municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 84,034 79,095
Debt Securities, Gross Unrealized Gains 4,077 2,726
Debt Securities, Gross Unrealized Loss 237 134
Debt securities at fair value 87,874 81,687
Tax-exempt municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 91,554 95,342
Debt Securities, Gross Unrealized Gains 4,991 4,696
Debt Securities, Gross Unrealized Loss 1 0
Debt securities at fair value 96,544 100,038
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 13,817 13,826
Debt Securities, Gross Unrealized Gains 467 485
Debt Securities, Gross Unrealized Loss 19 0
Debt securities at fair value 14,265 14,311
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost [2] 454 454
Debt Securities, Gross Unrealized Gains [2] 2 1
Debt Securities, Gross Unrealized Loss [2] 0 0
Debt securities at fair value [2] 456 455
Mortgage backed securities, excluding CMOs    
Debt Securities, Available-for-sale [Line Items]    
Debt securities at fair value 23,700 $ 23,500
Collateral Pledged    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, pledged as collateral $ 503,300  
[1] These categories may include investments issued or guaranteed by government sponsored enterprises such as Fannie Mae ("FNMA"), Freddie Mac ("FHLMC"), Federal Farm Credit Bank ("FFCB"), or one of several Federal Home Loan Banks, as well as, investments guaranteed by Ginnie Mae ("GNMA"), a wholly-owned government entity.
[2] CDs represent term deposits issued by banks that are subject to FDIC insurance and purchased on the open market.