Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis

Financial assets and financial liabilities measured at fair value on a recurring basis are as follows:

			Fair Value Measurements at Reporting Date Using
	Balance as of September 30, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale:
Obligations of U.S. government agencies	$	919,285	$	—	$	919,285	$	—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	1,059,261		—		1,059,261		—
Private mortgage-backed securities	608		—		608		—
Mortgage servicing rights	14,082		—		14,082		—

			Fair Value Measurements at Reporting Date Using
	Balance as of December 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale:
Obligations of U.S. government agencies	$	1,138,118	$	—	$	1,138,118	$	—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	877,997		—		877,997		—
Private mortgage-backed securities	749		—		749		—
Mortgage servicing rights	11,910		—		11,910		—
Derivative liability contract	383		—		—		383

Schedule of Derivative Liability Contract Measured at Fair Value on a Recurring Basis Unobservable Input Reconciliation

The following table reconciles the beginning and ending balances of the derivative liability contract measured at fair value on a recurring basis using significant unobservable (Level 3) inputs during the nine months ended September 30, 2012 and 2011:

Nine Months Ended September 30,	2012			2011
Balance, beginning of period	$	383		$	86
Accruals during the period	—			164
Cash payments during the period	(383		)	(128		)
Balance, end of period	$	—		$	122

Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Non-Recurring Basis

The following table presents information about the Company’s assets and liabilities measured at fair value on a non-recurring basis.

			Fair Value Measurements at Reporting Date Using
	Balance as of September 30, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans	$	66,555	$	—	$	—	$	66,555
Other real estate owned	17,089		—		—		17,089
Long-lived assets to be disposed of by sale	496		—		496		—
			Fair Value Measurements at Reporting Date Using
	Balance as of December 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans	$	100,035	$	—	$	—	$	100,035
Other real estate owned	17,000		—		—		17,000

Schedule of Estimated Fair Values of Financial Instruments by Level of Valuation Inputs

The estimated fair values of financial instruments that are reported at amortized cost in the Company's consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, are as follows:

					Fair Value Measurements at Reporting Date Using
As of September 30, 2012	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	611,335	$	611,335	$	—	$	611,335	$	—
Investment securities available-for-sale	1,979,154		1,979,154		—		1,979,154		—
Investment securities held-to-maturity	187,573		199,078		—		199,078		—
Accrued interest receivable	33,416		33,416		—		33,416		—
Mortgage servicing rights, net	12,334		14,082		—		14,082		—
Net loans	4,081,045		4,067,457		—		4,000,902		66,555
Total financial assets	$	6,904,857	$	6,904,522	$	—	$	6,837,967	$	66,555
Financial liabilities:
Total deposits, excluding time deposits	$	4,612,346	4,612,346		—		4,612,346		—
Time deposits	1,423,386		1,431,066		—		1,431,066		—
Securities sold under repurchase agreements	460,805		460,805		—		460,805		—
Other borrowed funds	6		6		—		6		—
Accrued interest payable	6,706		6,706		—		6,706		—
Long-term debt	37,170		34,003		—		34,003		—
Subordinated debentures held by subsidiary    trusts	82,477		57,656		—		57,656		—
Total financial liabilities	$	6,622,896	$	6,602,588	$	—	$	6,602,588	$	—

					Fair Value Measurements at Reporting Date Using
As of December 31, 2011	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	472,447	$	472,447	$	—	$	472,447	$	—
Investment securities available-for-sale	2,016,864		2,016,864		—		2,016,864		—
Investment securities held-to-maturity	152,781		161,877		—		161,877		—
Accrued interest receivable	31,974		31,974		—		31,974		—
Mortgage servicing rights, net	11,555		11,910		—		11,910		—
Net loans	4,073,968		4,064,718		—		3,964,683		100,035
Total financial assets	$	6,759,589	$	6,759,790	$	—	$	6,659,755	$	100,035
Financial liabilities:
Total deposits, excluding time deposits	$	4,269,631	$	4,269,631	$	—	$	4,269,631	$	—
Time deposits	1,557,340		1,565,558		—		1,565,558		—
Securities sold under repurchase agreements	516,243		516,243		—		516,243		—
Other borrowed funds	7		7		—		7		—
Accrued interest payable	8,123		8,123		—		8,123		—
Long-term debt	37,200		34,341		—		34,341		—
Subordinated debentures held by subsidiary    trusts	123,715		102,525		—		102,525		—
Derivative contract liability	383		383		—		—		383
Total financial liabilities	$	6,512,642	$	6,496,811	$	—	$	6,496,428	$	383