Fair Values of Assets and Liabilities (Measured on Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	$ 402,468	$ 414,614	[1]
U.S. government sponsored agencies debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	2,070	2,077
Residential mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	337,564	341,147
Residential mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	20,282	20,752
Commercial mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	21,590	21,439
Commercial mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	9,844	9,585
Business Development Company investment [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	2,651	2,737
Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	8,467	16,877
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	2,651	2,737
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	399,817	411,877
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	402,468	414,614
Mortgage servicing rights	1,587	1,552
Total assets at fair value	404,135	416,205
Recurring [Member] | Total [Member] | U.S. government sponsored agencies debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	2,070	2,077
Recurring [Member] | Total [Member] | Residential mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	337,564	341,147
Recurring [Member] | Total [Member] | Residential mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	20,282	20,752
Recurring [Member] | Total [Member] | Commercial mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	21,590	21,439
Recurring [Member] | Total [Member] | Commercial mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	9,844	9,585
Recurring [Member] | Total [Member] | Business Development Company investment [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	2,651	2,737
Recurring [Member] | Total [Member] | Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	8,467	16,877
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	2,651	2,737
Mortgage servicing rights	0	0
Total assets at fair value	2,651	2,737
Recurring [Member] | Level 1 [Member] | U.S. government sponsored agencies debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 1 [Member] | Residential mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 1 [Member] | Residential mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 1 [Member] | Commercial mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities		0
Recurring [Member] | Level 1 [Member] | Commercial mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 1 [Member] | Business Development Company investment [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	2,651	2,737
Recurring [Member] | Level 1 [Member] | Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	399,817	411,877
Mortgage servicing rights	0	0
Total assets at fair value	399,897	411,916
Recurring [Member] | Level 2 [Member] | U.S. government sponsored agencies debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	2,070	2,077
Recurring [Member] | Level 2 [Member] | Residential mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	337,564	341,147
Recurring [Member] | Level 2 [Member] | Residential mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	20,282	20,752
Recurring [Member] | Level 2 [Member] | Commercial mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	21,590	21,439
Recurring [Member] | Level 2 [Member] | Commercial mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	9,844	9,585
Recurring [Member] | Level 2 [Member] | Business Development Company investment [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 2 [Member] | Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	8,467	16,877
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	0	0
Mortgage servicing rights	1,587	1,552
Total assets at fair value	1,587	1,552
Recurring [Member] | Level 3 [Member] | U.S. government sponsored agencies debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 3 [Member] | Residential mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 3 [Member] | Residential mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 3 [Member] | Commercial mortgage-backed securities - GSE [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities		0
Recurring [Member] | Level 3 [Member] | Commercial mortgage-backed securities - Private [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 3 [Member] | Business Development Company investment [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 3 [Member] | Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale investment securities	0	0
Interest Rate Swap [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	0
Interest Rate Swap [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	41
Interest Rate Swap [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	0
Interest Rate Swap [Member] | Recurring [Member] | Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	41
Interest Rate Swap [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	0
Interest Rate Swap [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	41
Interest Rate Swap [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	0
Interest Rate Locks and Forward Loan Sales Commitments [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	0
Interest Rate Locks and Forward Loan Sales Commitments [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	39
Interest Rate Locks and Forward Loan Sales Commitments [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	0
Interest Rate Locks and Forward Loan Sales Commitments [Member] | Recurring [Member] | Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	39	39
Interest Rate Locks and Forward Loan Sales Commitments [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	0	0
Interest Rate Locks and Forward Loan Sales Commitments [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	39	39
Interest Rate Locks and Forward Loan Sales Commitments [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	$ 0	$ 0

[1] Derived from audited consolidated financial statements