Operating Segments and Related Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Operating Segments and Related Information
Number of reportable segments | segment	3
Number of operating segments | segment	3
Goodwill	$ 314,343		$ 267,685
Total Assets	9,537,334		7,702,357
Net interest income	68,383	$ 59,757
Non-interest income:	25,945	22,486
Non-interest expense:	57,163	51,040
Income before income taxes	35,054	30,195
Net income:	25,469	21,917
Operating segments | Banking
Operating Segments and Related Information
Goodwill	293,657		246,999
Total Assets	9,499,513		7,656,709
Net interest income	70,638	61,416
Non-interest income:	12,783	10,897
Non-interest expense:	45,171	41,386
Income before income taxes	36,139	29,919
Net income:	26,665	21,845
Operating segments | Remittance Processing
Operating Segments and Related Information
Goodwill	8,992		8,992
Total Assets	41,467		39,278
Net interest income	18	16
Non-interest income:	4,181	3,783
Non-interest expense:	2,764	2,466
Income before income taxes	1,435	1,333
Net income:	1,025	953
Operating segments | Wealth Management
Operating Segments and Related Information
Goodwill	11,694		11,694
Total Assets	22,894		20,992
Net interest income		94
Non-interest income:	9,133	8,641
Non-interest expense:	5,564	4,911
Income before income taxes	3,569	3,824
Net income:	2,641	2,764
Other
Operating Segments and Related Information
Total Assets	(26,540)		$ (14,622)
Net interest income	(2,273)	(1,769)
Non-interest income:	(152)	(835)
Non-interest expense:	3,664	2,277
Income before income taxes	(6,089)	(4,881)
Net income:	$ (4,862)	$ (3,645)