Consolidated Statements Of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
INTEREST INCOME:
Interest and fees on loans	$ 627,673	$ 594,103	$ 529,760
Interest on securities	46,295	45,342	36,917
Interest on other investments	10,818	10,727	5,427
Total interest income	684,786	650,172	572,104
INTEREST EXPENSE:
Interest on deposits	190,158	134,958	74,902
Interest on FHLB advances	12,031	15,127	10,706
Interest on other borrowings and convertible notes	16,002	12,160	5,116
Total interest expense	218,191	162,245	90,724
NET INTEREST INCOME BEFORE PROVISION FOR LOAN LOSSES	466,595	487,927	481,380
PROVISION FOR LOAN LOSSES	7,300	14,900	17,360
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	459,295	473,027	464,020
NONINTEREST INCOME:
Service fees on deposit accounts	17,933	18,551	20,619
International service fees	3,926	4,371	4,494
Loan servicing fees, net	2,316	4,696	5,433
Wire transfer fees	4,558	4,934	5,057
Net gains on sales of SBA loans	0	9,708	12,774
Net gains on sales of other loans	4,487	2,485	2,927
Net gains on sales or called securities available for sale	282	0	301
Other income and fees	16,181	15,435	14,810
Total noninterest income	49,683	60,180	66,415
NONINTEREST EXPENSE:
Salaries and employee benefits	161,174	153,523	144,669
Occupancy	30,735	30,371	28,587
Furniture and equipment	15,583	14,902	14,643
Advertising and marketing	9,146	9,414	10,281
Data processing and communication	10,780	14,232	12,179
Professional fees	22,528	16,286	14,954
FDIC assessments	3,882	6,572	5,173
Investments in affordable housing partnerships expenses	9,292	12,066	13,862
Credit related expenses	4,975	2,863	582
OREO (income) expense, net	(934)	187	3,100
Branch restructuring costs	0	1,674	0
Merger and integration expense	0	(7)	1,781
Other	15,467	15,643	16,790
Total noninterest expense	282,628	277,726	266,601
INCOME BEFORE INCOME TAX PROVISION	226,350	255,481	263,834
INCOME TAX PROVISION	55,310	65,892	124,389
NET INCOME	$ 171,040	$ 189,589	$ 139,445
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ 1.35	$ 1.44	$ 1.03
Diluted (in dollars per share)	$ 1.35	$ 1.44	$ 1.03