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FAIR VALUE MEASUREMENTS - Assets and Liabilities on Recurring and Nonrecurring Basis and Level 3 Valuation Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investment securities available for sale	$ 990,613	$ 689,132
Derivative assets	824	996
Derivative liabilities	4,162	4,376
Purchased accounts receivable	4,980	52,688
Other real estate	30,110	15,346
Mortgage Loan Servicing
Mortgage servicing rights	6,916	5,027	$ 4,127
SBA Loans
Mortgage servicing rights	5,241	4,485	$ 3,081
Quoted prices in active markets for identical assets (Level 1)
Investment securities available for sale	39,034	16,532
SBA loans held for investment	0	0
Derivative assets	0	0
Derivative liabilities	0	0
Significant other observable inputs (Level 2)
Investment securities available for sale	939,889	665,872
SBA loans held for investment	39,460	40,500
Derivative assets	397	588
Derivative liabilities	4,162	4,376
Significant unobservable inputs (Level 3)
Investment securities available for sale	11,690	6,728
SBA loans held for investment	0	0
Derivative assets	427	408
Derivative liabilities		0
Recurring \| Quoted prices in active markets for identical assets (Level 1)
Derivative assets	0	0
Derivative liabilities	0	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| GSE obligations
Investment securities available for sale	0	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| SBA-guaranteed securities
Investment securities available for sale	27,561	12,176
SBA-guaranteed loans held for sale	0	0
SBA loans held for investment	0	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Mortgage-backed securities issued by GSE
Investment securities available for sale	0	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Collateralized loan obligations
Investment securities available for sale	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Corporate bonds
Investment securities available for sale	2,554	2,485
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Non-agency RMBS
Investment securities available for sale		0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Non-agency CMBS
Investment securities available for sale	0	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Municipal bonds
Investment securities available for sale	0	0
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Other debt securities
Investment securities available for sale	245	245
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| Marketable equity securities
Investment securities available for sale	8,674	1,626
Recurring \| Significant other observable inputs (Level 2)
Derivative assets	397	588
Recurring \| Significant other observable inputs (Level 2) \| Pay fixed interest rate swaps
Derivative liabilities	4,162	4,376
Recurring \| Significant other observable inputs (Level 2) \| GSE obligations
Investment securities available for sale	17,501	5,982
Recurring \| Significant other observable inputs (Level 2) \| SBA-guaranteed securities
Investment securities available for sale	0	0
SBA-guaranteed loans held for sale	37,371	23,664
SBA loans held for investment	47,756	20,423
Recurring \| Significant other observable inputs (Level 2) \| Mortgage-backed securities issued by GSE
Investment securities available for sale	597,010	435,625
Recurring \| Significant other observable inputs (Level 2) \| Collateralized loan obligations
Investment securities available for sale	45,466
Recurring \| Significant other observable inputs (Level 2) \| Corporate bonds
Investment securities available for sale	139,951	110,427
Recurring \| Significant other observable inputs (Level 2) \| Non-agency RMBS
Investment securities available for sale		3,663
Recurring \| Significant other observable inputs (Level 2) \| Non-agency CMBS
Investment securities available for sale	15,394	50,483
Recurring \| Significant other observable inputs (Level 2) \| Municipal bonds
Investment securities available for sale	124,567	54,692
Recurring \| Significant other observable inputs (Level 2) \| Other debt securities
Investment securities available for sale	0	0
Recurring \| Significant other observable inputs (Level 2) \| Marketable equity securities
Investment securities available for sale	0	0
Recurring \| Significant unobservable inputs (Level 3)
Derivative assets	427	408
Derivative liabilities	0	0
Recurring \| Significant unobservable inputs (Level 3) \| Available-for-sale Securities \| Pricing model
Investment securities available for sale	$ 11,690	11,728
Valuation Technique	Pricing model
Unobservable Input	Illiquidity or credit factor in discount rates
Recurring \| Significant unobservable inputs (Level 3) \| Available-for-sale Securities \| Pricing model \| Minimum
Illiquidity of credit (as a percentage)	1.00%
Recurring \| Significant unobservable inputs (Level 3) \| Available-for-sale Securities \| Pricing model \| Maximum
Illiquidity of credit (as a percentage)	2.00%
Recurring \| Significant unobservable inputs (Level 3) \| Interest rate lock commitments \| Pricing model
Interest rate derivative assets, at fair value	$ 427	408
Valuation Technique	Pricing model
Unobservable Input	Pull through rates
Recurring \| Significant unobservable inputs (Level 3) \| Interest rate lock commitments \| Pricing model \| Minimum
Pull through rates (as a percentage)	80.00%
Recurring \| Significant unobservable inputs (Level 3) \| Interest rate lock commitments \| Pricing model \| Maximum
Pull through rates (as a percentage)	95.00%
Recurring \| Significant unobservable inputs (Level 3) \| GSE obligations
Investment securities available for sale	$ 0	0
Recurring \| Significant unobservable inputs (Level 3) \| SBA-guaranteed securities
Investment securities available for sale	0	0
SBA-guaranteed loans held for sale	0	0
SBA loans held for investment	0	0
Recurring \| Significant unobservable inputs (Level 3) \| Mortgage-backed securities issued by GSE
Investment securities available for sale	0	0
Recurring \| Significant unobservable inputs (Level 3) \| Collateralized loan obligations
Investment securities available for sale	0
Recurring \| Significant unobservable inputs (Level 3) \| Corporate bonds
Investment securities available for sale	10,710	10,620
Recurring \| Significant unobservable inputs (Level 3) \| Non-agency RMBS
Investment securities available for sale		0
Recurring \| Significant unobservable inputs (Level 3) \| Non-agency CMBS
Investment securities available for sale	0	0
Recurring \| Significant unobservable inputs (Level 3) \| Municipal bonds
Investment securities available for sale	980	1,108
Recurring \| Significant unobservable inputs (Level 3) \| Other debt securities
Investment securities available for sale	0	0
Recurring \| Significant unobservable inputs (Level 3) \| Marketable equity securities
Investment securities available for sale	0	0
Nonrecurring \| Quoted prices in active markets for identical assets (Level 1) \| Impaired loans
Impaired loans	0	0
Purchased accounts receivable	0
Nonrecurring \| Quoted prices in active markets for identical assets (Level 1) \| Foreclosed assets
Other real estate	0	0
Nonrecurring \| Quoted prices in active markets for identical assets (Level 1) \| Mortgage Loan Servicing
Mortgage servicing rights	0
Nonrecurring \| Quoted prices in active markets for identical assets (Level 1) \| SBA Loans
Mortgage servicing rights	0
Nonrecurring \| Significant other observable inputs (Level 2) \| Impaired loans
Impaired loans	0	0
Purchased accounts receivable	0
Nonrecurring \| Significant other observable inputs (Level 2) \| Foreclosed assets
Other real estate	0	0
Nonrecurring \| Significant other observable inputs (Level 2) \| Mortgage Loan Servicing
Mortgage servicing rights	6,916
Nonrecurring \| Significant other observable inputs (Level 2) \| SBA Loans
Mortgage servicing rights	$ 5,241
Nonrecurring \| Significant unobservable inputs (Level 3) \| Discounted appraisals
Valuation Technique	Discounted appraisals
Nonrecurring \| Significant unobservable inputs (Level 3) \| Impaired loans
Impaired loans	$ 26,493	15,066
Purchased accounts receivable	$ 4,980
Nonrecurring \| Significant unobservable inputs (Level 3) \| Impaired loans \| Discounted appraisals
Valuation Technique	Discounted appraisals
Unobservable Input	Collateral discounts
Nonrecurring \| Significant unobservable inputs (Level 3) \| Impaired loans \| Discounted appraisals \| Minimum
Collateral discounts (as a percentage)	15.00%
Nonrecurring \| Significant unobservable inputs (Level 3) \| Impaired loans \| Discounted appraisals \| Maximum
Collateral discounts (as a percentage)	50.00%
Nonrecurring \| Significant unobservable inputs (Level 3) \| Impaired loans \| Discounted expected cash flows
Valuation Technique	Discounted expected cash flows
Unobservable Input	Expected loss rates
Nonrecurring \| Significant unobservable inputs (Level 3) \| Impaired loans \| Discounted expected cash flows \| Minimum
Expected loss rates (as a percentage)	0.00%
Discount rates (as a percent)	2.00%
Nonrecurring \| Significant unobservable inputs (Level 3) \| Impaired loans \| Discounted expected cash flows \| Maximum
Expected loss rates (as a percentage)	75.00%
Discount rates (as a percent)	8.00%
Nonrecurring \| Significant unobservable inputs (Level 3) \| Impaired loans \| Discount rates
Unobservable Input	Discount rates
Nonrecurring \| Significant unobservable inputs (Level 3) \| Foreclosed assets
Other real estate	$ 30,110	15,346
Nonrecurring \| Significant unobservable inputs (Level 3) \| Foreclosed assets \| Discounted appraisals
Unobservable Input	Collateral discounts
Nonrecurring \| Significant unobservable inputs (Level 3) \| Foreclosed assets \| Discounted appraisals \| Minimum
Collateral discounts (as a percentage)	15.00%
Nonrecurring \| Significant unobservable inputs (Level 3) \| Foreclosed assets \| Discounted appraisals \| Maximum
Collateral discounts (as a percentage)	50.00%
Nonrecurring \| Significant unobservable inputs (Level 3) \| Mortgage Loan Servicing
Mortgage servicing rights	$ 0
Nonrecurring \| Significant unobservable inputs (Level 3) \| SBA Loans
Mortgage servicing rights	0
Estimate of Fair Value Measurement
Investment securities available for sale	990,613	689,132
SBA loans held for investment	39,460	40,500
Derivative assets	824	996
Derivative liabilities	4,162	4,376
Estimate of Fair Value Measurement \| Recurring
Derivative assets	824	996
Estimate of Fair Value Measurement \| Recurring \| Pay fixed interest rate swaps
Derivative liabilities	4,162	4,376
Estimate of Fair Value Measurement \| Recurring \| GSE obligations
Investment securities available for sale	17,501	5,982
Estimate of Fair Value Measurement \| Recurring \| SBA-guaranteed securities
Investment securities available for sale	27,561	12,176
SBA-guaranteed loans held for sale	37,371	23,664
SBA loans held for investment	47,756	20,423
Estimate of Fair Value Measurement \| Recurring \| Mortgage-backed securities issued by GSE
Investment securities available for sale	597,010	435,625
Estimate of Fair Value Measurement \| Recurring \| Collateralized loan obligations
Investment securities available for sale	45,466
Estimate of Fair Value Measurement \| Recurring \| Corporate bonds
Investment securities available for sale	153,215	123,532
Estimate of Fair Value Measurement \| Recurring \| Non-agency RMBS
Investment securities available for sale		3,663
Estimate of Fair Value Measurement \| Recurring \| Non-agency CMBS
Investment securities available for sale	15,394	50,483
Estimate of Fair Value Measurement \| Recurring \| Municipal bonds
Investment securities available for sale	125,547	55,800
Estimate of Fair Value Measurement \| Recurring \| Other debt securities
Investment securities available for sale	245	245
Estimate of Fair Value Measurement \| Recurring \| Marketable equity securities
Investment securities available for sale	8,674	1,626
Estimate of Fair Value Measurement \| Nonrecurring
Purchased accounts receivable	4,980	0
Estimate of Fair Value Measurement \| Nonrecurring \| Impaired loans
Impaired loans	26,493	15,066
Estimate of Fair Value Measurement \| Nonrecurring \| Foreclosed assets
Other real estate	30,110	15,346
Estimate of Fair Value Measurement \| Nonrecurring \| Foreclosed assets \| Discounted appraisals
Other real estate	30,110	$ 15,346
Estimate of Fair Value Measurement \| Nonrecurring \| Mortgage Loan Servicing
Mortgage servicing rights	6,916
Estimate of Fair Value Measurement \| Nonrecurring \| SBA Loans
Mortgage servicing rights	$ 5,241