Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

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
As of March 31, 2015	Balance		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	$	769,455	$	—	$	769,455	$	—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	1,007,300			—	1,007,300			—
Private mortgage-backed securities	302			—	302			—

			Fair Value Measurements at Reporting Date Using
As of December 31, 2014	Balance		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	$	720,933	$	—	$	720,933	$	—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	990,666			—	990,666			—
Private mortgage-backed securities	325			—	325			—

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
As of March 31, 2015	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans	$	35,098	$	—	$	—	$	35,098
Other real estate owned	6,499			—		—	6,499
Long-lived assets to be disposed of by sale	1,083			—		—	1,083
				Fair Value Measurements at Reporting Date Using
As of December 31, 2014	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans	$	30,494	$	—	$	—	$	30,494
Other real estate owned	4,554			—		—	4,554
Long-lived assets to be disposed of by sale	1,083			—		—	1,083

Fair Value Inputs, Assets, Quantitative Information

As of March 31, 2015	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
Impaired loans	$	35,098	Appraisal	Appraisal adjustment	0%	-	51%	(19%)
Other real estate owned	6,499		Appraisal	Appraisal adjustment	0%	-	50%	(15%)
Long-lived assets to be disposed of by sale	1,083		Appraisal	Appraisal adjustment	0%	-	9%	(5%)
As of December 31, 2014	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
Impaired loans	$	30,494	Appraisal	Appraisal adjustment	0%	-	51%	(19%)
Other real estate owned	4,554		Appraisal	Appraisal adjustment	0%	-	50%	(15%)
Long-lived assets to be disposed of by sale	1,083		Appraisal	Appraisal adjustment	0%	-	9%	(5%)

Fair Value, by Balance Sheet Grouping

					Fair Value Measurements at Reporting Date Using
As of March 31, 2015	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	$	637,803	$	637,803	$	637,803	$	—	$	—
Investment securities available-for-sale	1,777,057		1,777,057		—		1,777,057		—
Investment securities held-to-maturity	563,847		576,930		—		576,930		—
Accrued interest receivable	27,242		27,242		—		27,242		—
Mortgage servicing rights, net	14,093		26,639		—		26,639		—
Net loans	4,851,970		4,821,593		—		4,786,495		35,098
Total financial assets	$	7,872,012	$	7,867,264	$	637,803	$	7,194,363	$	35,098
Financial liabilities:
Total deposits, excluding time deposits	$	5,763,553	$	5,763,553	$	—	$	5,763,553	$	—
Time deposits	1,205,025		1,211,057		—		1,211,057		—
Securities sold under repurchase agreements	462,073		462,073		—		462,073		—
Other borrowed funds	4		4		—		4		—
Accrued interest payable	5,113		5,113		—		5,113		—
Long-term debt	43,048		38,047		—		38,047		—
Subordinated debentures held by subsidiary    trusts	82,477		75,679		—		75,679		—
Total financial liabilities	$	7,561,293	$	7,555,526	$	—	$	7,555,526	$	—

					Fair Value Measurements at Reporting Date Using
As of December 31, 2014	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	$	798,670	$	798,670	$	798,670	$	—	$	—
Investment securities available-for-sale	1,711,924		1,711,924		—		1,711,924		—
Investment securities held-to-maturity	575,186		584,533		—		584,533		—
Accrued interest receivable	27,063		27,063		—		27,063		—
Mortgage servicing rights, net	14,038		21,434		—		21,434		—
Net loans	4,823,243		4,800,725		—		4,770,231		30,494
Total financial assets	$	7,950,124	$	7,944,349	$	798,670	$	7,115,185	$	30,494
Financial liabilities:
Total deposits, excluding time deposits	$	5,767,992	$	5,767,992	$	5,767,992	$	—	$	—
Time deposits	1,238,220		1,244,324		—		1,244,324		—
Securities sold under repurchase agreements	502,250		502,250		—		502,250		—
Other borrowed funds	9		9		—		9		—
Accrued interest payable	5,833		5,833		—		5,833		—
Long-term debt	38,067		37,781		—		37,781		—
Subordinated debentures held by subsidiary    trusts	82,477		75,734		—		75,734		—
Total financial liabilities	$	7,634,848	$	7,633,923	$	5,767,992	$	1,865,931	$	—