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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 (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 62,192	$ 49,333
Charge-offs	(1,063)	(14,639)
Recoveries	244	570
Provision	2,512	19,499
Balance at end of period	63,885	54,763
Individually evaluated for impairment			$ 1,945		$ 1,680
Collectively evaluated for impairment			61,940		53,083
Total ending ALLL balance	62,192	49,333	63,885	$ 62,192	54,763
Loans:
Individually evaluated for impairment			32,964		26,057
Collectively evaluated for impairment			7,524,236		6,904,450
Total ending loan balances			7,557,200	7,700,873	6,930,507
Commercial | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	18,191	14,280
Charge-offs	(93)	(71)
Recoveries	33	61
Provision	762	3,301
Balance at end of period	18,893	17,571
Individually evaluated for impairment			48		1,115
Collectively evaluated for impairment			18,845		16,456
Total ending ALLL balance	18,191	14,280	18,893	18,191	17,571
Loans:
Individually evaluated for impairment			4,861		5,265
Collectively evaluated for impairment			1,902,241		1,633,294
Total ending loan balances			1,907,102	1,944,142	1,638,559
Commercial | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	6,674	4,971
Charge-offs	0	0
Recoveries	0	0
Provision	164	446
Balance at end of period	6,838	5,417
Individually evaluated for impairment			0		0
Collectively evaluated for impairment			6,838		5,417
Total ending ALLL balance	6,674	4,971	6,838	6,674	5,417
Loans:
Individually evaluated for impairment			573		0
Collectively evaluated for impairment			864,948		773,193
Total ending loan balances			865,521	867,013	773,193
Commercial | Multifamily
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	17,970	13,265
Charge-offs	0	0
Recoveries	0	0
Provision	928	954
Balance at end of period	18,898	14,219
Individually evaluated for impairment			0		0
Collectively evaluated for impairment			18,898		14,219
Total ending ALLL balance	17,970	13,265	18,898	17,970	14,219
Loans:
Individually evaluated for impairment			0		0
Collectively evaluated for impairment			2,332,527		1,944,082
Total ending loan balances			2,332,527	2,241,246	1,944,082
Commercial | SBA
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	1,827	1,701
Charge-offs	(356)	(381)
Recoveries	41	65
Provision	1,545	192
Balance at end of period	3,057	1,577
Individually evaluated for impairment			1,634		124
Collectively evaluated for impairment			1,423		1,453
Total ending ALLL balance	1,827	1,701	3,057	1,827	1,577
Loans:
Individually evaluated for impairment			3,808		359
Collectively evaluated for impairment			71,190		78,663
Total ending loan balances			74,998	68,741	79,022
Commercial | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	3,461	3,318
Charge-offs	0	0
Recoveries	0	0
Provision	(8)	(98)
Balance at end of period	3,453	3,220
Individually evaluated for impairment			0		0
Collectively evaluated for impairment			3,453		3,220
Total ending ALLL balance	3,461	3,318	3,453	3,461	3,220
Loans:
Individually evaluated for impairment			2,519		0
Collectively evaluated for impairment			209,030		200,766
Total ending loan balances			211,549	203,976	200,766
Commercial | Lease financing
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	0	0
Charge-offs	0	0
Recoveries	3	4
Provision	(3)	(4)
Balance at end of period	0	0
Individually evaluated for impairment			0		0
Collectively evaluated for impairment			0		0
Total ending ALLL balance	0	0	0	0	0
Loans:
Individually evaluated for impairment			0		0
Collectively evaluated for impairment			0		3
Total ending loan balances			0		3
Consumer | Single Family Residential Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	13,128	10,996
Charge-offs	(526)	(115)
Recoveries	150	436
Provision	(610)	652
Balance at end of period	12,142	11,969
Individually evaluated for impairment			230		420
Collectively evaluated for impairment			11,912		11,549
Total ending ALLL balance	13,128	10,996	12,142	13,128	11,969
Loans:
Individually evaluated for impairment			20,362		19,667
Collectively evaluated for impairment			2,082,332		2,181,691
Total ending loan balances			2,102,694		2,201,358
Consumer | Other Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	941	802
Charge-offs	(88)	(14,072)
Recoveries	17	4
Provision	(266)	14,056
Balance at end of period	604	790
Individually evaluated for impairment			33		21
Collectively evaluated for impairment			571		769
Total ending ALLL balance	$ 941	$ 802	604	$ 941	790
Loans:
Individually evaluated for impairment			841		766
Collectively evaluated for impairment			61,968		92,758
Total ending loan balances			$ 62,809		$ 93,524

X

- 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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