Operating Segments and Related Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Operating Segments and Related Information
Number of reportable segments | segment			3
Number of operating segments | segment			3
Goodwill	$ 267,685		$ 267,685		$ 269,346
Total Assets	7,775,544		7,775,544		7,860,640
Net interest income:	60,372	$ 42,366	120,129	$ 84,379
Non-interest income:	22,802	20,062	45,288	40,076
Non-interest expense:	47,305	36,768	98,345	74,387
Income before income taxes:	33,611	25,160	63,806	49,068
Net income:	24,862	16,479	46,779	31,649
Operating segments | Banking
Operating Segments and Related Information
Goodwill	246,999		246,999		248,660
Total Assets	7,719,424		7,719,424		7,809,738
Net interest income:	62,109	43,365	123,525	85,907
Non-interest income:	11,734	10,758	22,631	21,212
Non-interest expense:	37,855	29,331	79,241	58,621
Income before income taxes:	33,730	24,292	63,649	47,498
Net income:	24,904	15,855	46,749	30,604
Operating segments | Remittance Processing
Operating Segments and Related Information
Goodwill	8,992		8,992		8,992
Total Assets	36,572		36,572		34,646
Net interest income:	16	15	32	29
Non-interest income:	3,987	3,005	7,770	6,029
Non-interest expense:	2,624	2,174	5,090	4,286
Income before income taxes:	1,379	847	2,712	1,773
Net income:	986	508	1,939	1,062
Operating segments | Wealth Management
Operating Segments and Related Information
Goodwill	11,694		11,694		11,694
Total Assets	32,103		32,103		32,077
Net interest income:	100	90	194	146
Non-interest income:	7,808	6,691	16,449	13,708
Non-interest expense:	4,703	3,980	9,614	7,944
Income before income taxes:	3,205	2,801	7,029	5,910
Net income:	2,288	1,675	5,052	3,523
Other
Operating Segments and Related Information
Total Assets	(12,555)		(12,555)		$ (15,821)
Net interest income:	(1,853)	(1,104)	(3,622)	(1,703)
Non-interest income:	(727)	(392)	(1,562)	(873)
Non-interest expense:	2,123	1,283	4,400	3,536
Income before income taxes:	(4,703)	(2,780)	(9,584)	(6,113)
Net income:	$ (3,316)	$ (1,559)	$ (6,961)	$ (3,540)