Taxes on Income (Temporary Differences That Give Rise to the Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Provision for loan losses	$ 19,246	$ 18,213
Net operating loss carryforward	12,674	24,705
Tax credit carryforward	3,070	2,419
Write-down on other real estate	1,669	831
Nonaccrual loan interest	527	321
Deferred compensation & profit sharing accrual	551	518
Investments	457	29
Total deferred tax assets	38,194	47,036
Deferred tax liabilities:
Accumulated depreciation	(2,835)	(3,112)
Amortizable assets	(749)	(868)
Dividend - Equity vs. Cost Method	(492)
Prepaid expenses	(254)	(320)
FHLB stock dividends	(220)	(277)
Stock-based compensation	(216)	92
Section 597 gain - FNBA FDIC assisted acquistion	(119)	(281)
Other	(51)	(74)
Total deferred tax liabilities	(4,936)	(4,840)
Deferred taxes (payable) receivable on investment securities available for sale	(1,075)	(1,286)
Net deferred tax assets	$ 32,183	$ 40,910