Operating Segments and Related Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	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	7,889,385		7,889,385		7,860,640
Net interest income:	60,774	$ 55,941	180,903	$ 140,320
Non-interest income:	21,853	20,837	67,141	60,913
Non-interest expense:	45,929	46,939	144,274	121,326
Income before income taxes:	35,940	28,345	99,746	77,413
Net income:	26,859	18,784	73,638	50,433
Operating segments | Banking
Operating Segments and Related Information
Goodwill	246,999		246,999		248,660
Total Assets	7,831,967		7,831,967		7,809,738
Net interest income:	62,578	57,589	186,103	143,496
Non-interest income:	11,196	12,338	33,827	33,550
Non-interest expense:	37,034	38,697	116,275	97,318
Income before income taxes:	35,982	29,736	99,631	77,234
Net income:	26,486	18,942	73,235	49,546
Operating segments | Remittance Processing
Operating Segments and Related Information
Goodwill	8,992		8,992		8,992
Total Assets	37,809		37,809		34,646
Net interest income:	17	15	49	44
Non-interest income:	4,042	3,032	11,812	9,061
Non-interest expense:	2,718	2,190	7,808	6,476
Income before income taxes:	1,341	856	4,053	2,629
Net income:	957	505	2,896	1,567
Operating segments | Wealth Management
Operating Segments and Related Information
Goodwill	11,694		11,694		11,694
Total Assets	33,543		33,543		32,077
Net interest income:	110	87	304	233
Non-interest income:	7,391	5,941	23,840	19,649
Non-interest expense:	4,307	3,896	13,921	11,840
Income before income taxes:	3,194	2,132	10,223	8,042
Net income:	2,280	1,237	7,332	4,760
Other
Operating Segments and Related Information
Total Assets	(13,934)		(13,934)		$ (15,821)
Net interest income:	(1,931)	(1,750)	(5,553)	(3,453)
Non-interest income:	(776)	(474)	(2,338)	(1,347)
Non-interest expense:	1,870	2,156	6,270	5,692
Income before income taxes:	(4,577)	(4,379)	(14,161)	(10,492)
Net income:	$ (2,864)	$ (1,900)	$ (9,825)	$ (5,440)