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Securities - Fair Values and Amortized Costs 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 [1] $ 763,696 $ 768,427
Debt Securities, Available-for-Sale, Gross Unrealized Gains [1] 32,281 11,659
Debt Securities, Available-for-Sale, Gross Unrealized Losses [1] (11) (953)
Debt Securities, Available-for-Sale, Fair Value [1] 795,966 779,133
Marketable equity securities 3,566 5,150
Total Securities 799,532 784,283
Interest receivable 3,500 3,400
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost 9,972 9,969
Debt Securities, Available-for-Sale, Gross Unrealized Gains 400 71
Debt Securities, Available-for-Sale, Gross Unrealized Losses 0  
Debt Securities, Available-for-Sale, Fair Value 10,372 10,040
Obligations of U.S. government corporations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost 132,938 155,969
Debt Securities, Available-for-Sale, Gross Unrealized Gains 5,044 1,773
Debt Securities, Available-for-Sale, Gross Unrealized Losses 0 (45)
Debt Securities, Available-for-Sale, Fair Value 137,982 157,697
Collateralized mortgage obligations of U.S. government corporations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost 180,682 186,879
Debt Securities, Available-for-Sale, Gross Unrealized Gains 8,790 2,773
Debt Securities, Available-for-Sale, Gross Unrealized Losses 0 (304)
Debt Securities, Available-for-Sale, Fair Value 189,472 189,348
Residential mortgage-backed securities of U.S. government corporations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost 20,391 22,120
Debt Securities, Available-for-Sale, Gross Unrealized Gains 802 321
Debt Securities, Available-for-Sale, Gross Unrealized Losses 0 (23)
Debt Securities, Available-for-Sale, Fair Value 21,193 22,418
Commercial mortgage-backed securities of U.S. government corporations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost 272,651 273,771
Debt Securities, Available-for-Sale, Gross Unrealized Gains 12,028 2,680
Debt Securities, Available-for-Sale, Gross Unrealized Losses 0 (581)
Debt Securities, Available-for-Sale, Fair Value 284,679 275,870
Corporate obligations    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost 7,532 7,603
Debt Securities, Available-for-Sale, Gross Unrealized Gains 30 24
Debt Securities, Available-for-Sale, Gross Unrealized Losses (11) 0
Debt Securities, Available-for-Sale, Fair Value 7,551 7,627
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-Sale, Amortized Cost 139,530 112,116
Debt Securities, Available-for-Sale, Gross Unrealized Gains 5,187 4,017
Debt Securities, Available-for-Sale, Gross Unrealized Losses 0 0
Debt Securities, Available-for-Sale, Fair Value $ 144,717 $ 116,133
[1] Excludes interest receivable of $3.5 million at March 31, 2020 and $3.4 million at December 31, 2019. Interest receivable is included in other assets in the consolidated balance sheets.