Fair Value Accounting and Measurement (Quantitative Information About Level 3 Fair Value Measurements) (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified															3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2011 Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2012 Noncovered Loans [Member]	Jun. 30, 2011 Noncovered Loans [Member]	Jun. 30, 2012 Noncovered Loans [Member] Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2011 Noncovered Loans [Member] Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2012 Covered Loans [Member]	Jun. 30, 2011 Covered Loans [Member]	Jun. 30, 2012 Covered Loans [Member] Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2011 Covered Loans [Member] Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2012 Real Estate Collateral [Member] Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2012 Other Collateral [Member] Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2012 Other Collateral [Member] Market Approach Valuation Technique [Member] Impaired Loans [Member] Minimum [Member] Fair Value, Inputs, Level 3 [Member]		Jun. 30, 2012 Other Collateral [Member] Market Approach Valuation Technique [Member] Impaired Loans [Member] Maximum [Member] Fair Value, Inputs, Level 3 [Member]		Jun. 30, 2012 Other Collateral [Member] Market Approach Valuation Technique [Member] Impaired Loans [Member] Weighted Average [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	$ 14,139	$ 13,924	$ 14,139	$ 13,924									$ 11,896	$ 2,243
OREO					4,430	6,846	4,430	6,846	1,491	428	1,491	428
OPPO					$ 880	$ 0	$ 880	$ 0
Fair Value Inputs, Comparability Adjustments															0.00%	[1],[2]	70.00%	[1],[2]	27.00%	[1],[2]

[1] (3) Other collateral consists of accounts receivable and inventory.

[2] (1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable and inventory).