Operating Segments and Related Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Operating Segments and Related Information
Number of reportable segments | segment			3
Number of operating segments | segment			3
Goodwill	$ 314,343,000		$ 314,343,000		$ 267,685,000
Total Assets	9,612,667,000		9,612,667,000		7,702,357,000
Net interest income	73,428,000	$ 60,372,000	141,811,000	$ 120,129,000
Non-interest income:	27,896,000	22,802,000	53,841,000	45,288,000
Non-interest expense:	68,020,000	47,305,000	125,183,000	98,345,000
Income before income taxes	30,787,000	33,611,000	65,841,000	63,806,000
Net income:	24,085,000	24,862,000	49,554,000	46,779,000
Operating segments | Banking
Operating Segments and Related Information
Goodwill	293,657,000		293,657,000		246,999,000
Total Assets	9,568,148,000		9,568,148,000		7,656,709,000
Net interest income	75,944,000	62,109,000	146,582,000	123,525,000
Non-interest income:	15,659,000	11,734,000	28,442,000	22,631,000
Non-interest expense:	56,895,000	37,855,000	102,066,000	79,241,000
Income before income taxes	32,191,000	33,730,000	68,330,000	63,649,000
Net income:	24,441,000	24,904,000	51,106,000	46,749,000
Operating segments | Remittance Processing
Operating Segments and Related Information
Goodwill	8,992,000		8,992,000		8,992,000
Total Assets	42,083,000		42,083,000		39,278,000
Net interest income	18,000	16,000	36,000	32,000
Non-interest income:	4,117,000	3,987,000	8,298,000	7,770,000
Non-interest expense:	2,589,000	2,624,000	5,353,000	5,090,000
Income before income taxes	1,546,000	1,379,000	2,981,000	2,712,000
Net income:	1,105,000	986,000	2,130,000	1,939,000
Operating segments | Wealth Management
Operating Segments and Related Information
Goodwill	11,694,000		11,694,000		11,694,000
Total Assets	26,015,000		26,015,000		20,992,000
Net interest income		100,000		194,000
Non-interest income:	9,594,000	7,808,000	18,727,000	16,449,000
Non-interest expense:	5,749,000	4,703,000	11,313,000	9,614,000
Income before income taxes	3,845,000	3,205,000	7,414,000	7,029,000
Net income:	2,845,000	2,288,000	5,486,000	5,052,000
Other
Operating Segments and Related Information
Total Assets	(23,579,000)		(23,579,000)		$ (14,622,000)
Net interest income	(2,534,000)	(1,853,000)	(4,807,000)	(3,622,000)
Non-interest income:	(1,474,000)	(727,000)	(1,626,000)	(1,562,000)
Non-interest expense:	2,787,000	2,123,000	6,451,000	4,400,000
Income before income taxes	(6,795,000)	(4,703,000)	(12,884,000)	(9,584,000)
Net income:	$ (4,306,000)	$ (3,316,000)	$ (9,168,000)	$ (6,961,000)