REGULATORY MATTERS, Reconciliation of Stockholders' Equity to Regulatory Capital for the Bank (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Stockholders' Equity to Regulatory Capital for the Bank [Line Items]
Stockholders' equity	$ 435,506	$ 391,574	$ 361,034
Non-allowable assets:
Accumulated other comprehensive loss	(4,759)	(9,640)	(9,709)
Total (Tier 2) risk-based capital	397,935	405,077
Minimum capital requirement	(376,717)	(383,042)
Tangible Capital [Member]
Reconciliation of Stockholders' Equity to Regulatory Capital for the Bank [Line Items]
Stockholders' equity	427,209	428,892
Non-allowable assets:
Mortgage Servicing Rights (MSR)	(63)	(111)
Accumulated other comprehensive loss	5,209	9,899
Goodwill	(55,638)	(55,638)
Tier I risk-based capital	376,717	383,042
General regulatory valuation allowance	0	0
Total (Tier 2) risk-based capital	376,717	383,042
Minimum capital requirement	158,298	153,493
Regulatory capital excess	218,419	229,549
Leverage Capital [Member]
Reconciliation of Stockholders' Equity to Regulatory Capital for the Bank [Line Items]
Stockholders' equity	427,209	428,892
Non-allowable assets:
Mortgage Servicing Rights (MSR)	(63)	(111)
Accumulated other comprehensive loss	5,209	9,899
Goodwill	(55,638)	(55,638)
Tier I risk-based capital	376,717	383,042
General regulatory valuation allowance	0	0
Total (Tier 2) risk-based capital	376,717	383,042
Minimum capital requirement	158,298	153,493
Regulatory capital excess	218,419	229,549
Total Risk-Based Capital [Member]
Reconciliation of Stockholders' Equity to Regulatory Capital for the Bank [Line Items]
Stockholders' equity	427,209	428,892
Non-allowable assets:
Mortgage Servicing Rights (MSR)	(63)	(111)
Accumulated other comprehensive loss	5,209	9,899
Goodwill	(55,638)	(55,638)
Tier I risk-based capital	376,717	383,042
General regulatory valuation allowance	21,218	22,035
Total (Tier 2) risk-based capital	397,935	405,077
Minimum capital requirement	238,338	228,232
Regulatory capital excess	$ 159,597	$ 176,845