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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) $ in Thousands	Mar. 31, 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	$ 6,235	$ 9,529
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 480	$ 487
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item	6,000	10,000
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value	$ 115,753	$ 122,608
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 5,084	$ 6,127
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	30,000	34,000
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value	$ 5,870	$ 3,605
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss	$ 63	$ 51
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, Number of Investments | item	3	2
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value	$ 40,524	$ 54,908
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss	$ 714	$ 1,556
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	27	32
US government agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value	$ 0	$ 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 0	$ 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item	0	0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value	$ 29,464	$ 29,026
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 536	$ 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	$ 3,623	$ 3,605
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss	$ 15	$ 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	$ 36,833	$ 41,448
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss	$ 652	$ 1,236
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	26	29
Commercial mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value	$ 0	$ 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 0	$ 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item	0	0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value	$ 36,976	$ 37,752
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 1,165	$ 1,261
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	8	8
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value		$ 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss		$ 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, Number of Investments | item		0
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	$ 171	$ 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	$ 34,834	$ 35,472
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 558	$ 964
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	8	8
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value	$ 0	$ 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss	$ 0	$ 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, Number of Investments | item	0	0
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value	$ 3,691	$ 3,605
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss	$ 62	$ 156
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	1	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	$ 115	$ 3,310
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 1	$ 48
Available-for-sale securities, continuous unrealized loss position, less than 12 months, Number of Investments | item	1	5
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value	$ 5,278	$ 11,068
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 93	$ 285
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	4	8
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value	$ 2,247	$ 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss	$ 48	$ 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, Number of Investments | item	1	0
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value	$ 0	$ 2,199
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss	$ 0	$ 96
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	0	1
Collateralized debt obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value	$ 5,949	$ 5,987
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	$ 478	$ 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	$ 9,201	$ 9,290
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	$ 2,732	$ 2,643
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, Number of Investments | item	5	5

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