Fair Values Of Assets And Liabilities (Narrative) (Detail) (USD $)																						3 Months Ended					3 Months Ended											3 Months Ended
	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013		Mar. 31, 2014 Municipal Bonds [Member]	Dec. 31, 2013 Municipal Bonds [Member]	Mar. 31, 2013 Municipal Bonds [Member]	Dec. 31, 2012 Municipal Bonds [Member]	Mar. 31, 2014 Equity Securities [Member]	Dec. 31, 2013 Equity Securities [Member]	Mar. 31, 2013 Equity Securities [Member]	Dec. 31, 2012 Equity Securities [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member]	Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member]	Mar. 31, 2014 Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2013 Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2013 Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2014 Level 3 [Member] Fair Value, Measurements, Recurring [Member] Equity Securities [Member]	Mar. 31, 2014 Level 3 [Member] Fair Value, Measurements, Recurring [Member] Equity Securities [Member] Minimum [Member]	Mar. 31, 2014 Level 3 [Member] Fair Value, Measurements, Recurring [Member] Equity Securities [Member] Maximum [Member]	Mar. 31, 2014 Level 3 [Member] Fair Value, Measurements, Recurring [Member] Equity Securities [Member] Weighted Average [Member]	Mar. 31, 2014 Level 3 [Member] Fair Value, Measurements, Nonrecurring [Member]	Mar. 31, 2014 Level 3 [Member] Other Real Estate Owned [Member] Fair Value, Measurements, Nonrecurring [Member]	Mar. 31, 2014 Level 3 [Member] Other Real Estate Owned [Member] Fair Value, Measurements, Nonrecurring [Member] Minimum [Member]	Mar. 31, 2014 Level 3 [Member] Other Real Estate Owned [Member] Fair Value, Measurements, Nonrecurring [Member] Maximum [Member]	Mar. 31, 2014 Estimate of Fair Value Measurement [Member]	Dec. 31, 2013 Estimate of Fair Value Measurement [Member]	Mar. 31, 2013 Estimate of Fair Value Measurement [Member]	Mar. 31, 2014 Valued Using Discounted Cash Flow Model [Member]	Mar. 31, 2014 Mortgage Servicing Rights [Member]	Dec. 31, 2013 Mortgage Servicing Rights [Member]	Mar. 31, 2013 Mortgage Servicing Rights [Member]	Dec. 31, 2012 Mortgage Servicing Rights [Member]	Mar. 31, 2014 Mortgage Servicing Rights [Member] Level 3 [Member] Fair Value, Measurements, Recurring [Member] Minimum [Member]	Mar. 31, 2014 Mortgage Servicing Rights [Member] Level 3 [Member] Fair Value, Measurements, Recurring [Member] Maximum [Member]	Mar. 31, 2014 Mortgage Servicing Rights [Member] Level 3 [Member] Fair Value, Measurements, Recurring [Member] Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value							$ 39,772,000	$ 36,386,000	$ 32,324,000	$ 30,770,000	$ 23,438,000	$ 22,163,000	$ 24,470,000	$ 22,169,000																				$ 8,719,000	$ 8,946,000	$ 7,344,000	$ 6,750,000
Fair Value Inputs, Discount Rate																							1.44%	2.33%	1.93%			0.00%	84.00%									9.50%	13.00%	9.66%
Fair Value Inputs, Prepayment Rate																																						10.00%	15.00%	11.95%
Remaining contractual principal balance outstanding, mortgage loans held-for-sale																														199,300,000	314,900,000	366,800,000
Mortgage loans held-for-sale															215,231,000	332,485,000	370,570,000		0	0	0
Mortgages held for sale, past due 90 days and accruing	0		0		0
Total impaired loans	142,977,000	[1]	162,229,000	[1]	203,554,000	[1]																											74,600,000
Impaired Loans Fair Value Disclosure																		68,355,000								68,355,000
Other real estate owned																		$ 129,279,000								$ 129,279,000
Level Three Fair Value Measurements Weighted Average Percentage																						1.93%					4.65%

[1] Impaired loans are considered by the Company to be non-accrual loans, TDRs or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.