Fair Values of Assets and Liabilities (Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	$ 385,994	$ 390,434	[1]
U.S. Government-sponsored agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total		2,008
Residential mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	277,062	278,107
Residential mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	31,434	33,577
Commercial mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	22,122	21,612
Commercial mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	17,848	17,575
Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	37,528	37,555
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Level 1 [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swaps	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	385,994	390,434
Level 2 [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swaps	(1,627)
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Level 3 [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swaps	0
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	385,994	390,433
Mortgage servicing rights	2,654	2,231
Total assets at fair value	387,021	391,909
Recurring [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swaps	(1,627)	(755)
Recurring [Member] | U.S. Government-sponsored agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	2,008
Recurring [Member] | Residential mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	277,062	278,107
Recurring [Member] | Residential mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	31,434	33,577
Recurring [Member] | Commercial mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	22,122	21,611
Recurring [Member] | Commercial mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	17,848	17,575
Recurring [Member] | Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	37,528	37,555
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Mortgage servicing rights	0	0
Total assets at fair value	0	0
Recurring [Member] | Level 1 [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swaps	0	0
Recurring [Member] | Level 1 [Member] | U.S. Government-sponsored agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Recurring [Member] | Level 1 [Member] | Residential mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Recurring [Member] | Level 1 [Member] | Residential mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Recurring [Member] | Level 1 [Member] | Commercial mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Recurring [Member] | Level 1 [Member] | Commercial mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Recurring [Member] | Level 1 [Member] | Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	385,994	390,433
Mortgage servicing rights	0	0
Total assets at fair value	384,367	389,678
Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swaps	(1,627)	(755)
Recurring [Member] | Level 2 [Member] | U.S. Government-sponsored agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	2,008
Recurring [Member] | Level 2 [Member] | Residential mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	277,062	278,107
Recurring [Member] | Level 2 [Member] | Residential mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	31,434	33,577
Recurring [Member] | Level 2 [Member] | Commercial mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	22,122	21,611
Recurring [Member] | Level 2 [Member] | Commercial mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	17,848	17,575
Recurring [Member] | Level 2 [Member] | Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	37,528	37,555
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Mortgage servicing rights	2,654	2,231
Total assets at fair value	2,654	2,231
Recurring [Member] | Level 3 [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swaps	0	0
Recurring [Member] | Level 3 [Member] | U.S. Government-sponsored agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Recurring [Member] | Level 3 [Member] | Residential mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Recurring [Member] | Level 3 [Member] | Residential mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Recurring [Member] | Level 3 [Member] | Commercial mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Recurring [Member] | Level 3 [Member] | Commercial mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	0	0
Recurring [Member] | Level 3 [Member] | Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total	$ 0	$ 0

[1] Derived from audited consolidated financial statements