Federal Home Loan Bank Advances and Other Borrowings (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Federal Home Loan Bank Advances and Other Borrowings
Maximum percentage of assets up to which advances will be provided by FHLB	45.00%
Maximum credit line available from FHLB	$ 704,300,000
Aggregate principal balance of real estate loans used to collateralize FHLB advances	549,700,000
FHLB stock used to collateralize FHLB advances	7,483,000	9,228,000
Additional available advances	227,700,000
Activities in advances from the FHLB
Average balance outstanding	26,137,000	9,154,000
Maximum amount outstanding at any month-end during the year	156,000,000	87,000,000
Balance outstanding at end of year	156,000,000	87,000,000
Federal Home Loan Bank Advances and Other Borrowings
Estimated fair value of MBS used to secure outstanding borrowings	34,900,000
Securities sold under agreement to repurchase	28,500,000
Weighted average rate for securities sold under agreement to repurchase (as a percent)	0.15%	0.28%
Credit facilities | Citigroup
Activities in other borrowings
Balance outstanding at end of year	18,500,000	18,500,000
Credit facilities | Barclays Bank
Activities in other borrowings
Balance outstanding at end of year	10,000,000	10,000,000
Reverse repurchase facility
Federal Home Loan Bank Advances and Other Borrowings
Estimated fair value of MBS used to secure outstanding borrowings	18,600,000
Securities sold under agreement to repurchase	18,600,000
Weighted average rate for securities sold under agreement to repurchase (as a percent)	0.02%
Reverse repurchase facility | Union Bank
Federal Home Loan Bank Advances and Other Borrowings
Unused facility	50,000,000
Unsecured lines of credit
Federal Home Loan Bank Advances and Other Borrowings
Unused facility	59,000,000
Number of correspondent banks	7
Amount outstanding	1,000,000	0
Other Borrowings
Activities in other borrowings
Average balance outstanding	45,310,000	28,500,000
Maximum amount outstanding at any month-end during the year	52,077,000	28,500,000
Balance outstanding at end of year	48,091,000	28,500,000
Weighted average interest rate during the year (as a percent)	2.09%	3.31%
Federal Reserve discount window
Federal Home Loan Bank Advances and Other Borrowings
Unused facility	$ 3,300,000