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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) $ in Thousands	Jun. 30, 2019 USD ($) item	Dec. 31, 2018 USD ($) item
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value	$ 5,848	$ 9,529
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 612	$ 487
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item	4	10
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value	$ 66,025	$ 122,608
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 3,416	$ 6,127
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	17	34
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value	$ 5,287	$ 3,605
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss	$ 16	$ 51
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, Number of Investments | item	2	2
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value	$ 19,088	$ 54,908
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss	$ 329	$ 1,556
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	20	32
US government agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value	$ 29,833	$ 29,026
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 167	$ 974
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	5	5
Residential mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value	$ 5,287	$ 3,605
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss	$ 16	$ 51
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, Number of Investments | item	2	2
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value	$ 19,088	$ 41,448
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss	$ 329	$ 1,236
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	20	29
Commercial mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value	$ 18,918	$ 37,752
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 284	$ 1,261
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	5	8
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value		$ 7,656
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss		$ 68
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item		1
Collateralized mortgage obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value		$ 232
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses		$ 1
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item		1
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value	$ 8,250	$ 35,472
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 62	$ 964
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	2	8
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value		$ 3,605
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss		$ 156
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item		1
Obligations of states and political subdivisions [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value		$ 3,310
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses		$ 48
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item		5
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value		$ 11,068
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses		$ 285
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item		8
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value		$ 2,199
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss		$ 96
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item		1
Collateralized debt obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value	$ 5,848	$ 5,987
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 612	$ 438
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item	4	4
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value	$ 9,024	$ 9,290
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 2,903	$ 2,643
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	5	5

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