Fair Value Measurement (Fair Value, by Balance Sheet Grouping) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 111,787	$ 77,834	$ 86,373	$ 34,144
Available-for-sale Securities	134,832	133,328
Restricted stock, Carrying Amount	3,050	3,571
Loans held for sale, Carrying Amount	327	67
Net loans, Carrying Amount	735,221	743,200
Accrued interest receivable, Carrying Amount	3,045	3,178
Mortgage servicing rights, Carrying Amount	185	235
Deposits, Carrying Amount	902,178	874,440
Securities sold under agreements to repurchase, Carrying Amount	39,365	42,209
Long-term debt, Carrying Amount	12,408	12,410
Accrued interest payable, Carrying Amount	469	348
Interest rate swaps, Carrying Amount	922	1,103
Cash and cash equivalents, Fair Value	111,787	77,834
Investment securities available for sale, at fair value	134,832	133,328
Restricted Stock, Fair Value	3,050	3,571
Loans held for sale, Fair Value	327	67
Net loans, Fair Value	747,245	759,490
Accrued interest receivable, Fair Value	3,045	3,178
Mortgage servicing rights, Fair Value	185	235	375
Deposits, Fair Value	903,796	876,240
Securities sold under agreements to repurchase, Fair Value	39,365	42,209
Long-term debt, Fair Value	13,323	13,718
Accrued interest payable, Fair Value	469	348
Interest rate swaps, Fair Value	922	1,103
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Fair Value	111,787	77,834
Investment securities available for sale, at fair value	2,199	1,941
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale, at fair value	132,633	131,387
Restricted Stock, Fair Value	3,050	3,571
Loans held for sale, Fair Value	327	67
Accrued interest receivable, Fair Value	3,045	3,178
Deposits, Fair Value	903,796	876,240
Securities sold under agreements to repurchase, Fair Value	39,365	42,209
Long-term debt, Fair Value	13,323	13,718
Accrued interest payable, Fair Value	469	348
Interest rate swaps, Fair Value	922	1,103
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net loans, Fair Value	747,245	759,490
Mortgage servicing rights, Fair Value	$ 185	$ 235