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Securities (Schedule of Investments' Gross Unrealized Losses and Fair Value Aggregated by Security Type and Length of Time that Individual Securities have been in a Continuous Unrealized Loss Position) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value $ 2,520 $ 29,629
Less than 12 Months, Unrealized Losses (13) (433)
12 Months or More, Fair Value 181,331 186,285
12 Months or More, Unrealized Losses (4,074) (7,011)
Total, Fair Value 183,851 215,914
Total, Unrealized Losses (4,087) (7,444)
States and Political Subdivisions [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 773 19,140
Less than 12 Months, Unrealized Losses (11) (390)
12 Months or More, Fair Value 52,523 56,740
12 Months or More, Unrealized Losses (477) (1,600)
Total, Fair Value 53,296 75,880
Total, Unrealized Losses (488) (1,990)
Corporate Obligations [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 0 2,045
Less than 12 Months, Unrealized Losses 0 (21)
12 Months or More, Fair Value 8,747 6,595
12 Months or More, Unrealized Losses (107) (235)
Total, Fair Value 8,747 8,640
Total, Unrealized Losses (107) (256)
Mortgage-backed Securities-Government Sponsored Entities [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 1,747 8,444
Less than 12 Months, Unrealized Losses (2) (22)
12 Months or More, Fair Value 120,061 122,950
12 Months or More, Unrealized Losses (3,490) (5,176)
Total, Fair Value 121,808 131,394
Total, Unrealized Losses $ (3,492) $ (5,198)