Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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- Definition

The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Loans and Allowance for Loan Losses (Details 2) (Acquired loans, USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Loans and Allowance for Loan Losses
Total acquired loans	$ 3,013,103		$ 1,074,742	$ 520,991
Less allowance for loan losses	(31,141)	(31,597)	(32,132)	(31,138)	(35,813)	(31,620)
Acquired loans, net	2,981,962		1,042,610	489,853
Construction and land development
Loans and Allowance for Loan Losses
Total acquired loans	132,176			58,317
Less allowance for loan losses	(4,353)	(4,392)	(1,628)	(1,494)	(3,238)
Commercial Loans Greater Than or Equal to $1 Million-CBT
Loans and Allowance for Loan Losses
Total acquired loans	37,894			53,301
Less allowance for loan losses	(12,145)	(13,428)	(15,408)	(15,812)	(16,871)	(16,706)
Commercial and industrial
Loans and Allowance for Loan Losses
Total acquired loans	81,734			37,499
Less allowance for loan losses	(2,898)	(2,953)	(4,305)	(4,271)	(4,749)	(4,564)
Residential real estate
Loans and Allowance for Loan Losses
Total acquired loans	505,127			205,441
Less allowance for loan losses	(5,638)	(5,150)	(4,616)	(4,456)	(4,415)	(5,471)
Consumer
Loans and Allowance for Loan Losses
Total acquired loans	108,420			10,125
Less allowance for loan losses	(472)	(474)	(96)	(89)	(73)
Single pay
Loans and Allowance for Loan Losses
Total acquired loans	4,451			4,864
Less allowance for loan losses	(4,484)	(4,379)	(4,562)	(4,569)	(4,655)	(3,561)
FASB ASC Topic 310-20
Loans and Allowance for Loan Losses
Total acquired loans	1,665,333		73,215
FASB ASC Topic 310-20 \| Commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Total acquired loans	120,440		3,716
FASB ASC Topic 310-20 \| Construction and land development
Loans and Allowance for Loan Losses
Total acquired loans	55,259		839
FASB ASC Topic 310-20 \| Commercial non-owner occupied
Loans and Allowance for Loan Losses
Total acquired loans	65,181		2,877
FASB ASC Topic 310-20 \| Consumer real estate
Loans and Allowance for Loan Losses
Total acquired loans	1,043,979		36,139
FASB ASC Topic 310-20 \| Consumer owner occupied
Loans and Allowance for Loan Losses
Total acquired loans	769,086
FASB ASC Topic 310-20 \| Home equity loans
Loans and Allowance for Loan Losses
Total acquired loans	274,893		36,139
FASB ASC Topic 310-20 \| Commercial owner occupied real estate
Loans and Allowance for Loan Losses
Total acquired loans	83,133		12,141
FASB ASC Topic 310-20 \| Commercial and industrial
Loans and Allowance for Loan Losses
Total acquired loans	64,069		17,531
FASB ASC Topic 310-20 \| Other income producing property
Loans and Allowance for Loan Losses
Total acquired loans	78,344		3,688
FASB ASC Topic 310-20 \| Consumer
Loans and Allowance for Loan Losses
Total acquired loans	275,368
FASB ASC Topic 310-30
Loans and Allowance for Loan Losses
Total acquired loans	1,347,770		1,001,527	520,991
Less allowance for loan losses	(31,141)		(32,132)	(31,138)
Acquired loans, net	1,316,629		969,395	489,853
FASB ASC Topic 310-30 \| Construction and land development
Loans and Allowance for Loan Losses
Total acquired loans	132,176		130,451	58,317
FASB ASC Topic 310-30 \| Commercial Loans Greater Than or Equal to $1 Million-CBT
Loans and Allowance for Loan Losses
Total acquired loans	37,894		49,684	53,301
FASB ASC Topic 310-30 \| Consumer real estate
Loans and Allowance for Loan Losses
Total acquired loans	477,968		372,924	151,444
FASB ASC Topic 310-30 \| Commercial and industrial
Loans and Allowance for Loan Losses
Total acquired loans	81,734		72,884	37,499
FASB ASC Topic 310-30 \| Residential real estate
Loans and Allowance for Loan Losses
Total acquired loans	505,127		355,127	205,441
FASB ASC Topic 310-30 \| Consumer
Loans and Allowance for Loan Losses
Total acquired loans	108,420		15,685	10,125
FASB ASC Topic 310-30 \| Single pay
Loans and Allowance for Loan Losses
Total acquired loans	$ 4,451		$ 4,772	$ 4,864