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Investment Securities Debt Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 476,446 $ 491,290
Debt Securities, Gross Unrealized Gains 31,324 13,965
Debt Securities, Gross Unrealized Loss 96 467
Debt securities at fair value 507,674 504,788
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] 1 5
Debt Securities, Gross Unrealized Loss [1] 0 0
Debt securities at fair value [1] 1,001 1,004
Residential federal agency MBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost [1] 178,325 190,392
Debt Securities, Gross Unrealized Gains [1] 7,828 2,599
Debt Securities, Gross Unrealized Loss [1] 51 333
Debt securities at fair value [1] 186,102 192,658
Commercial federal agency MBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost [1] 109,233 111,182
Debt Securities, Gross Unrealized Gains [1] 8,232 3,453
Debt Securities, Gross Unrealized Loss [1] 0 0
Debt securities at fair value [1] 117,465 114,635
Taxable municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 83,989 79,095
Debt Securities, Gross Unrealized Gains 7,985 2,726
Debt Securities, Gross Unrealized Loss 45 134
Debt securities at fair value 91,929 81,687
Tax-exempt municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 90,537 95,342
Debt Securities, Gross Unrealized Gains 6,396 4,696
Debt Securities, Gross Unrealized Loss 0 0
Debt securities at fair value 96,933 100,038
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 12,908 13,826
Debt Securities, Gross Unrealized Gains 882 485
Debt Securities, Gross Unrealized Loss 0 0
Debt securities at fair value 13,790 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] 0 1
Debt Securities, Gross Unrealized Loss [2] 0 0
Debt securities at fair value [2] 454 455
Mortgage backed securities, excluding CMOs    
Debt Securities, Available-for-sale [Line Items]    
Debt securities at fair value 23,000 $ 23,500
Collateral Pledged    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, pledged as collateral $ 496,700  
[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.