Intangible Assets (Activity for Capitalized MSRs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Capitalized MSRs [Roll Forward]
Balance at beginning of period	$ 15,388
Amortization	(1,001)	(1,067)
Balance at end of period	14,902	10,939
Mortgage servicing rights [Member]
Capitalized MSRs [Roll Forward]
Balance at beginning of period	3,478	3,593
Additions	515	534
Amortization	(508)	(700)
Balance at end of period	$ 3,485	$ 3,427