Deposits and Borrowed Funds (Details 4) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Maturity distribution of long-term debt
2015	$ 14,000,000
2016	32,300,000
2017	37,800,000
2018	16,300,000
Thereafter	635,600,000
Total long-term debt	735,968,000	706,051,000
Remaining borrowing capacity secured by collateral with FHLB	5,220,000,000
Senior notes
Maturity distribution of long-term debt
Thereafter	299,500,000
Total long-term debt	299,500,000
Subordinated and junior subordinated debt
Maturity distribution of long-term debt
Thereafter	335,100,000
Total long-term debt	335,100,000
Nonrecourse debt
Maturity distribution of long-term debt
2015	14,000,000
2016	32,300,000
2017	27,800,000
2018	16,300,000
Thereafter	1,000,000
Total long-term debt	91,400,000
Other long-term debt
Maturity distribution of long-term debt
2017	10,000,000
Total long-term debt	$ 10,000,000