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OTHER INTANGIBLE ASSETS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Changes in other intangible assets
Balance, beginning of period	$ 37,499
Additions	924
Amortization	(2,248)
Balance, end of period	36,175
Other disclosures
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans	4,128	2,977
Gross carrying value, accumulated amortization and net carrying value related to intangible assets
Gross Carrying Value	97,305		98,081
Accumulated Amortization	(61,130)		(60,582)
Net Carrying Value	36,175
Estimated Amortization Expense
2013 (remainder)	6,321
2014	7,718
2015	7,154
2016	6,666
2017	6,285
2018	2,031
Net Carrying Value	36,175
Core Deposit Premium
Changes in other intangible assets
Balance, beginning of period	15,378
Amortization	(669)
Balance, end of period	14,709
Gross carrying value, accumulated amortization and net carrying value related to intangible assets
Gross Carrying Value	44,642		44,642
Accumulated Amortization	(29,933)		(29,264)
Net Carrying Value	14,709
Estimated Amortization Expense
2013 (remainder)	2,006
2014	2,674
2015	2,674
2016	2,674
2017	2,674
2018	2,007
Net Carrying Value	14,709
Mortgage Servicing Rights
Changes in other intangible assets
Balance, beginning of period	22,121
Additions	924
Amortization	(1,579)	(100)
Balance, end of period	21,466
Other disclosures
Income generated as a result of new mortgage servicing rights reported as gains on sale of loans	900	1,200
Fair market value and key assumptions used in determining the fair market value
Fair market value, beginning of period	22,356	23,149
Fair market value, end of period	21,595	23,275
Weighted average discount rate (as a percent)	8.00%	8.50%
Weighted average prepayment speed assumption (as a percent)	14.10%	14.00%
Gross carrying value, accumulated amortization and net carrying value related to intangible assets
Gross Carrying Value	52,663		51,739
Accumulated Amortization	(31,197)		(29,618)
Net Carrying Value	21,466
Estimated Amortization Expense
2013 (remainder)	4,315
2014	5,044
2015	4,480
2016	3,992
2017	3,611
2018	24
Net Carrying Value	21,466
Customer Relationships
Gross carrying value, accumulated amortization and net carrying value related to intangible assets
Gross Carrying Value			1,400
Accumulated Amortization			(1,400)
Non-compete Agreements
Gross carrying value, accumulated amortization and net carrying value related to intangible assets
Gross Carrying Value			300
Accumulated Amortization			$ (300)

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

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Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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