Basis Of Presentation And Accounting Policies (Carrying Amount And Estimated Fair Value Of Company's Financial Instruments) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Financial assets:
Loans, net	$ 1,975,541
Financial liabilities:
Deposits	2,546,740
Other borrowings	3,835
Carrying Amount
Financial assets:
Loans, net	1,941,028	1,868,419	1,812,029
Financial liabilities:
Deposits	2,544,672	2,591,566	2,511,363
Other borrowings	3,810	20,000
Level 1
Financial liabilities:
Other borrowings	3,835
Level 2
Financial assets:
Loans, net	1,975,541
Financial liabilities:
Deposits	2,546,740
Fair Value
Financial assets:
Loans, net		1,877,320	1,818,152
Financial liabilities:
Deposits		2,593,113	2,513,459
Other borrowings		$ 20,936