CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Acquisition-related costs	$ 301	$ 0	$ 2,449	$ 0
INTEREST INCOME:
Loans receivable	117,007	99,853	232,462	193,875
Mortgage-backed securities	9,794	8,899	20,301	16,230
Securities and cash equivalents	4,037	3,671	8,071	7,138
Total interest income	130,838	112,423	260,834	217,243
INTEREST EXPENSE:
Deposits	9,023	4,264	17,666	7,622
FHLB advances	3,370	1,499	6,846	2,177
Other borrowings	67	49	127	119
Junior subordinated debentures	1,683	1,548	3,396	2,889
Total interest expense	14,143	7,360	28,035	12,807
Net interest income	116,695	105,063	232,799	204,436
PROVISION FOR LOAN LOSSES	2,000	2,000	4,000	4,000
Net interest income after provision for loan losses	114,695	103,063	228,799	200,436
NON-INTEREST INCOME:
Deposit fees and other service charges	14,046	11,985	26,664	23,281
Bank-owned life insurance (BOLI)	1,123	933	2,399	1,785
Miscellaneous	1,713	3,388	2,517	4,426
Other operating income	22,818	20,949	40,931	38,999
Net (loss) gain on sale of securities	(28)	44	(27)	48
Net change in valuation of financial instruments carried at fair value	(114)	224	(103)	3,532
Total non-interest income	22,676	21,217	40,801	42,579
NON-INTEREST EXPENSE:
Salary and employee benefits	55,629	51,494	110,269	101,561
Less capitalized loan origination costs	(7,399)	(4,733)	(12,248)	(8,744)
Occupancy and equipment	12,681	11,574	26,447	23,340
Information/computer data services	5,273	4,564	10,599	8,945
Payment and card processing expenses	4,041	3,731	8,025	7,431
Professional and legal expenses	2,336	3,838	4,770	8,266
Advertising and marketing	2,065	2,141	3,594	3,971
Deposit insurance	1,418	1,021	2,836	2,362
State/municipal business and use taxes	1,007	816	1,952	1,529
REO operations, net	260	(319)	137	121
Amortization of core deposit intangibles	2,053	1,382	4,105	2,764
Miscellaneous	7,051	7,128	13,795	12,797
Total non-interest expense	86,716	82,637	176,730	164,343
Noninterest Operating Expense, Before Acquisition Related Costs	86,415	82,637	174,281	164,343
Income before provision for income taxes	50,655	41,643	92,870	78,672
PROVISION FOR INCOME TAXES	10,955	9,219	19,824	17,458
NET INCOME	$ 39,700	$ 32,424	$ 73,046	$ 61,214
Earnings per common share:
Basic	$ 1.14	$ 1.01	$ 2.09	$ 1.89
Diluted	1.14	1.00	2.09	1.89
Cumulative dividends declared per common share	$ 0.41	$ 0.85	$ 0.82	$ 1.20
Weighted average number of common shares outstanding, Basic	34,831,047	32,250,514	34,940,106	32,323,635
Weighted average number of common shares outstanding, Diluted	34,882,359	32,331,609	35,028,881	32,422,287
Mortgage Banking [Member]
NON-INTEREST INCOME:
Mortgage banking operations	$ 5,936	$ 4,643	$ 9,351	$ 9,507