Operating Segments and Related Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Operating Segments and Related Information
Number of reportable segments | segment			3
Number of operating segments | segment			3
Goodwill	$ 322,699,000		$ 322,699,000		$ 267,685,000
Total Assets	9,753,760,000		9,753,760,000		7,702,357,000
Net interest income	73,476,000	$ 60,774,000	215,287,000	$ 180,903,000
Non-interest income:	30,936,000	21,853,000	84,777,000	67,141,000
Non-interest expense:	68,121,000	45,929,000	193,304,000	144,274,000
Income before income taxes	32,880,000	35,940,000	98,721,000	99,746,000
Net income:	24,828,000	26,859,000	74,382,000	73,638,000
Operating segments | Banking
Operating Segments and Related Information
Goodwill	293,431,000		293,431,000		246,999,000
Total Assets	9,704,121,000		9,704,121,000		7,656,709,000
Net interest income	75,955,000	62,578,000	222,537,000	186,103,000
Non-interest income:	18,301,000	11,196,000	46,743,000	33,827,000
Non-interest expense:	56,593,000	37,034,000	158,659,000	116,275,000
Income before income taxes	34,252,000	35,982,000	102,582,000	99,631,000
Net income:	25,731,000	26,486,000	76,837,000	73,235,000
Operating segments | Remittance Processing
Operating Segments and Related Information
Goodwill	8,992,000		8,992,000		8,992,000
Total Assets	43,138,000		43,138,000		39,278,000
Net interest income	20,000	17,000	56,000	49,000
Non-interest income:	4,088,000	4,042,000	12,386,000	11,812,000
Non-interest expense:	2,746,000	2,718,000	8,099,000	7,808,000
Income before income taxes	1,362,000	1,341,000	4,343,000	4,053,000
Net income:	972,000	957,000	3,102,000	2,896,000
Operating segments | Wealth Management
Operating Segments and Related Information
Goodwill	20,276,000		20,276,000		11,694,000
Total Assets	28,587,000		28,587,000		20,992,000
Net interest income		110,000		304,000
Non-interest income:	8,994,000	7,391,000	27,721,000	23,840,000
Non-interest expense:	6,043,000	4,307,000	17,356,000	13,921,000
Income before income taxes	2,951,000	3,194,000	10,365,000	10,223,000
Net income:	2,184,000	2,280,000	7,670,000	7,332,000
Other
Operating Segments and Related Information
Total Assets	(22,086,000)		(22,086,000)		$ (14,622,000)
Net interest income	(2,499,000)	(1,931,000)	(7,306,000)	(5,553,000)
Non-interest income:	(447,000)	(776,000)	(2,073,000)	(2,338,000)
Non-interest expense:	2,739,000	1,870,000	9,190,000	6,270,000
Income before income taxes	(5,685,000)	(4,577,000)	(18,569,000)	(14,161,000)
Net income:	$ (4,059,000)	$ (2,864,000)	$ (13,227,000)	$ (9,825,000)