Other Borrowings and Notes Payable-Term Loan (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Nov. 05, 2012
Debt Instrument [Line Items]
Securities sold under repurchase agreements	$ 200,021,000	$ 229,560,000
Secured borrowings	3,810,000	3,810,000
Total other borrowings	203,831,000	233,370,000
Borrowings [Member]
Debt Instrument [Line Items]
Average balance during the year	197,556,000	134,093,000
Maximum balance outstanding at any month-end	214,439,000	233,370,000
Average interest rate during the year	0.32%	0.42%
Average interest rate at December 31	0.31%	0.49%
Loans payable [Member]
Debt Instrument [Line Items]
Average balance during the year	11,241,000	1,835,000
Maximum balance outstanding at any month-end	11,700,000	12,000,000
Average interest rate during the year	3.52%	3.50%
Average interest rate at December 31	3.44%	3.50%
Face amount			12,000,000
Term Loan	10,500,000	11,700,000
Line of Credit [Member]
Debt Instrument [Line Items]
Remaining borrowing capacity	607,000,000
Collateral	$ 714,100,000