Operating Segments and Related Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Operating Segments and Related Information
Number of reportable segments | segment									3
Number of operating segments | segment									3
Goodwill	$ 311,536				$ 267,685				$ 311,536	$ 267,685
Total Assets	9,695,729				7,702,357				9,695,729	7,702,357
Net interest income	71,936	$ 73,476	$ 73,428	$ 68,383	60,503	$ 60,774	$ 60,372	$ 59,757	287,223	241,406	$ 203,366
Non-interest income:	31,638	30,936	27,896	25,945	22,852	21,853	22,802	22,486	116,415	89,993	84,474
Non-interest expense:	65,490	68,121	68,020	57,163	48,769	45,929	47,305	51,040	258,794	193,043	174,426
Income before income taxes	35,717	32,880	30,787	35,054	34,181	35,940	33,611	30,195	134,438	133,927	108,111
Net income:	28,571	$ 24,828	$ 24,085	$ 25,469	25,290	$ 26,859	$ 24,862	$ 21,917	102,953	98,928	62,726
Banking
Operating Segments and Related Information
Goodwill	288,436				246,999				288,436	246,999
Remittance Processing
Operating Segments and Related Information
Goodwill	8,992				8,992				8,992	8,992
Wealth Management
Operating Segments and Related Information
Goodwill	14,108				11,694				14,108	11,694
Operating segments | Banking
Operating Segments and Related Information
Goodwill	288,436				246,999				288,436	246,999
Total Assets	9,632,368				7,656,709				9,632,368	7,656,709
Net interest income									296,754	248,291	208,184
Non-interest income:									63,613	43,197	47,524
Non-interest expense:									211,559	154,455	139,521
Income before income taxes									138,401	132,604	110,884
Net income:									106,409	97,369	65,704
Operating segments | Remittance Processing
Operating Segments and Related Information
Goodwill	8,992				8,992				8,992	8,992
Total Assets	44,209				39,278				44,209	39,278
Net interest income									76	67	60
Non-interest income:									16,450	15,876	12,137
Non-interest expense:									10,990	10,749	8,704
Income before income taxes									5,536	5,194	3,493
Net income:									4,060	3,710	2,007
Operating segments | Wealth Management
Operating Segments and Related Information
Goodwill	14,108				11,694				14,108	11,694
Total Assets	32,760				20,992				32,760	20,992
Net interest income										327	321
Non-interest income:									39,075	31,621	27,270
Non-interest expense:									24,534	19,283	17,079
Income before income taxes									14,541	12,665	10,512
Net income:									11,135	9,372	6,229
Other
Operating Segments and Related Information
Total Assets	$ (13,608)				$ (14,622)				(13,608)	(14,622)
Net interest income									(9,607)	(7,279)	(5,199)
Non-interest income:									(2,723)	(701)	(2,457)
Non-interest expense:									11,711	8,556	9,122
Income before income taxes									(24,040)	(16,536)	(16,778)
Net income:									$ (18,651)	$ (11,523)	$ (11,214)