Fair value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of year	$ 9,288	$ 73,832
Total realized and unrealized gains (losses) Included in earnings	(381)	241
Included in other comprehensive income	0	0
Net transfers in and/or out of Level 3	(3,317)	(64,785)
Balance at end of period	5,590	9,288
Impaired Loans [Member]
Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of year	7,759	64,655
Total realized and unrealized gains (losses) Included in earnings	0	0
Included in other comprehensive income	0	0
Net transfers in and/or out of Level 3	(3,506)	(56,896)
Balance at end of period	4,253	7,759
Real Estate Owned [Member]
Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of year	1,529	9,177
Total realized and unrealized gains (losses) Included in earnings	(381)	241
Included in other comprehensive income	0	0
Net transfers in and/or out of Level 3	189	(7,889)
Balance at end of period	$ 1,337	$ 1,529