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Loans and Allowance for Loan Losses (Details 6) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Activity in ALLL by class of loans
Beginning balance	$ 38,725	$ 37,656
Charge-offs	(533)	(532)
Recoveries	172	336
Net charge-offs	(361)	(196)
Provisions charged to operations	300	173
Ending balance	38,664	37,633
Individually evaluated for impairment	6,517	8,001
Collectively evaluated for impairment	32,147	29,632
Individually evaluated for impairment	63,351	71,115
Collectively evaluated for impairment	3,150,306	2,966,137
Loans acquired with deteriorated credit quality	6,310	12,124
Ending balance	3,219,967	3,049,376	3,242,427
Non-residential real estate [Member]
Activity in ALLL by class of loans
Beginning balance	14,969	13,948
Charge-offs	(18)	(121)
Recoveries	19	37
Net charge-offs	1	(84)
Provisions charged to operations	361	245
Ending balance	15,331	14,109
Individually evaluated for impairment	2,694	3,085
Collectively evaluated for impairment	12,637	11,024
Individually evaluated for impairment	35,678	38,489
Collectively evaluated for impairment	1,208,364	1,063,425
Ending balance	1,244,042	1,101,914
Residential real estate [Member]
Activity in ALLL by class of loans
Beginning balance	9,815	9,764
Charge-offs	(151)	(36)
Recoveries	13	96
Net charge-offs	(138)	60
Provisions charged to operations	244	(62)
Ending balance	9,921	9,762
Individually evaluated for impairment	2,123	2,692
Collectively evaluated for impairment	7,798	7,070
Individually evaluated for impairment	18,797	21,002
Collectively evaluated for impairment	754,996	675,068
Ending balance	773,793	696,070
Non-consumer non-real estate [Member]
Activity in ALLL by class of loans
Beginning balance	9,385	9,156
Charge-offs	(36)	(17)
Recoveries	31	98
Net charge-offs	(5)	81
Provisions charged to operations	(398)	(39)
Ending balance	8,982	9,198
Individually evaluated for impairment	1,211	1,741
Collectively evaluated for impairment	7,771	7,457
Individually evaluated for impairment	6,329	8,958
Collectively evaluated for impairment	744,272	716,130
Ending balance	750,601	725,088
Consumer non-real estate [Member]
Activity in ALLL by class of loans
Beginning balance	2,451	2,315
Charge-offs	(140)	(114)
Recoveries	76	84
Net charge-offs	(64)	(30)
Provisions charged to operations	(3)	(2)
Ending balance	2,384	2,283
Individually evaluated for impairment	290	300
Collectively evaluated for impairment	2,094	1,983
Individually evaluated for impairment	2,301	2,519
Collectively evaluated for impairment	209,019	197,689
Ending balance	211,320	200,208
Other loans [Member]
Activity in ALLL by class of loans
Beginning balance	1,885	1,886
Charge-offs	(139)	(180)
Recoveries		19
Net charge-offs	(139)	(161)
Provisions charged to operations	76	125
Ending balance	1,822	1,850
Individually evaluated for impairment	199	183
Collectively evaluated for impairment	1,623	1,667
Individually evaluated for impairment	246	147
Collectively evaluated for impairment	143,780	163,341
Ending balance	144,026	163,488
Acquired loans [Member]
Activity in ALLL by class of loans
Beginning balance	220	587
Charge-offs	(49)	(64)
Recoveries	33	2
Net charge-offs	(16)	(62)
Provisions charged to operations	20	(94)
Ending balance	224	431
Collectively evaluated for impairment	224	431
Collectively evaluated for impairment	89,875	150,484
Loans acquired with deteriorated credit quality	6,310	12,124
Ending balance	$ 96,185	$ 162,608

X

- Definition

Reflects the net amount of other additions and reductions in the reserve for credit losses.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Number 210

-Section 03

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The balance of financing receivables that were acquired with deteriorated credit quality.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of direct write-downs of financing receivables charged against the allowance.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Number AAG-DEP

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