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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Allowance for Loan and Lease Losses and Recorded Investment Excluding Accrued Interest in Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	$ 49,333	$ 40,444
Charge-offs	(18,499)	(5,581)	$ (2,618)
Recoveries	1,143	771	2,258
Provision	30,215	13,699
Balance at end of year	62,192	49,333	40,444
Individually evaluated for impairment				$ 829	$ 1,217
Collectively evaluated for impairment				61,363	48,116
Total ending allowance balance	49,333	40,444	40,444	62,192	49,333	$ 35,533
Loans:
Individually evaluated for impairment				26,945	24,050
Collectively evaluated for impairment				7,673,928	6,635,357
Total ending loan balances				7,700,873	6,659,407
Commercial | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	14,280	7,584
Charge-offs	(1,927)	(1,730)
Recoveries	396	54
Provision	5,442	8,372
Balance at end of year	18,191	14,280	7,584
Individually evaluated for impairment				0	498
Collectively evaluated for impairment				18,191	13,782
Total ending allowance balance	14,280	7,584	7,584	18,191	14,280
Loans:
Individually evaluated for impairment				5,455	3,582
Collectively evaluated for impairment				1,938,687	1,698,369
Total ending loan balances				1,944,142	1,701,951
Commercial | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	4,971	5,467
Charge-offs	0	(113)
Recoveries	0	0
Provision	1,703	(383)
Balance at end of year	6,674	4,971	5,467
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				6,674	4,971
Total ending allowance balance	4,971	5,467	5,467	6,674	4,971
Loans:
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				867,013	717,415
Total ending loan balances				867,013	717,415
Commercial | Multifamily
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	13,265	11,376
Charge-offs	(14)	0
Recoveries	0	0
Provision	4,719	1,889
Balance at end of year	17,970	13,265	11,376
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				17,970	13,265
Total ending allowance balance	13,265	11,376	11,376	17,970	13,265
Loans:
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				2,241,246	1,816,141
Total ending loan balances				2,241,246	1,816,141
Commercial | SBA
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	1,701	939
Charge-offs	(1,927)	(625)
Recoveries	273	422
Provision	1,780	965
Balance at end of year	1,827	1,701	939
Individually evaluated for impairment				562	435
Collectively evaluated for impairment				1,265	1,266
Total ending allowance balance	1,701	939	939	1,827	1,701
Loans:
Individually evaluated for impairment				2,376	944
Collectively evaluated for impairment				66,365	77,755
Total ending loan balances				68,741	78,699
Commercial | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	3,318	2,015
Charge-offs	0	(29)
Recoveries	0	0
Provision	143	1,332
Balance at end of year	3,461	3,318	2,015
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				3,461	3,318
Total ending allowance balance	3,318	2,015	2,015	3,461	3,318
Loans:
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				203,976	182,960
Total ending loan balances				203,976	182,960
Commercial | Lease financing
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	0	6
Charge-offs	0	0
Recoveries	15	32
Provision	(15)	(38)
Balance at end of year	0	0	6
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				0	0
Total ending allowance balance	0	6	6	0	0
Loans:
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				0	13
Total ending loan balances				0	13
Consumer | Single Family Residential Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	10,996	12,075
Charge-offs	(558)	(2,806)
Recoveries	436	1
Provision	2,254	1,726
Balance at end of year	13,128	10,996	12,075
Individually evaluated for impairment				161	277
Collectively evaluated for impairment				12,967	10,719
Total ending allowance balance	10,996	12,075	12,075	13,128	10,996
Loans:
Individually evaluated for impairment				18,193	14,699
Collectively evaluated for impairment				2,287,297	2,040,950
Total ending loan balances				2,305,490	2,055,649
Consumer | Other Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	802	982
Charge-offs	(14,073)	(278)
Recoveries	23	262
Provision	14,189	(164)
Balance at end of year	941	802	982
Individually evaluated for impairment				106	7
Collectively evaluated for impairment				835	795
Total ending allowance balance	$ 802	$ 982	$ 982	941	802
Loans:
Individually evaluated for impairment				921	4,825
Collectively evaluated for impairment				69,344	101,754
Total ending loan balances				$ 70,265	$ 106,579

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- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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