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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) $ in Thousands	Sep. 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	$ 15,265	$ 9,529
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 1,256	$ 487
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item	6	10
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value	$ 51,903	$ 122,608
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 3,921	$ 6,127
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	14	34
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value	$ 4,745	$ 3,605
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss	$ 2	$ 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	$ 10,626	$ 54,908
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss	$ 127	$ 1,556
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	12	32
US government agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value	$ 9,971
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 29
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	$ 29,943	$ 29,026
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 57	$ 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	$ 4,745	$ 3,605
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss	$ 2	$ 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	$ 10,626	$ 41,448
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss	$ 127	$ 1,236
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	12	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	$ 6,370	$ 37,752
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 43	$ 1,261
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	3	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	$ 28	$ 232
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 1	$ 1
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item	1	1
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value	$ 7,389	$ 35,472
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 99	$ 964
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	1	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	$ 5,266	$ 5,987
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 1,226	$ 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	$ 8,201	$ 9,290
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 3,722	$ 2,643
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	5	5

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