CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net income	$ 39,209,000	$ 36,105,000	$ 25,528,000
Adjustments to reconcile net income to net cash from Operating activities:
Depreciation and amortization of premises, and equipment	1,914,000	1,833,000	525,000
Net accretion of securities, loans, deposits, and other	(2,845,000)	(1,754,000)	(4,801,000)
Unrealized gain on equity securities	(147,000)
Amortization of investment in affordable housing tax credits	900,000	644,000	316,000
Amortization of intangible assets	4,856,000	3,302,000	1,845,000
Provision (recapture) for loan losses	2,390,000	4,469,000	(1,053,000)
Stock-based compensation	689,000	684,000	779,000
Deferred tax benefit	1,503,000	(383,000)	5,083,000
Gain on sale of securities	(7,000)	(5,000)
Gain on sale of loans	(9,893,000)	(7,126,000)	(9,318,000)
Loss (gain) on sale of OREO	106,000		(142,000)
Gain on sale of fixed assets	(6,000)
Increase in cash surrender value of life insurance	(775,000)	(797,000)	(824,000)
Loans originated and purchased for sale, net	(77,514,000)	(413,450,000)	(254,629,000)
Proceeds from loans sold	521,594,000	301,894,000	265,497,000
Other items	(5,506,000)	(10,064,000)	(23,000)
Net cash provided by (used in) operating activities	476,468,000	(84,648,000)	28,783,000
Securities available for sale:
Purchases	(197,386,000)	(74,171,000)	(29,557,000)
Maturities, prepayments and calls	141,537,000	64,008,000	4,353,000
Sales	6,143,000	44,591,000	0
Securities held to maturity:
Maturities, prepayments and calls	1,590,000		1,100,000
Redemption of Federal Home Loan Bank stock	808,000
Purchase of Federal Home Loan Bank stock and other equity securities, net	(7,741,000)	(11,077,000)	(837,000)
Net increase of investment in qualified affordable housing projects	(2,598,000)	(1,911,000)	(5,000,000)
Net increase in loans	(161,426,000)	(366,415,000)	(218,897,000)
Proceeds from sales of OREO	1,053,000		257,000
Purchase of bank owned life insurance			(10,000,000)
Net cash paid in connection with acquisition		25,073,000
Proceeds from sale of fixed assets	17,000
Purchases of premises and equipment	(1,350,000)	(2,488,000)	(684,000)
Net cash used in investing activities	(219,353,000)	(322,390,000)	(264,446,000)
Financing activities
Net (decrease) increase in demand deposits and savings accounts	(21,758,000)	(9,807,000)	226,382,000
Net increase (decrease) in time deposits	126,627,000	186,588,000	(41,772,000)
Net (decrease) increase in FHLB advances	(319,500,000)	170,000,000	25,000,000
Cash dividends paid	(8,033,000)	(5,753,000)	(5,118,000)
Issuance of subordinated debentures, net of issuance costs		54,018,000
Issuance of common stock, net of issuance costs			60,210,000
Common stock repurchased, net of repurchased costs	(3,190,000)
Exercise of stock options	2,817,000	9,629,000	2,296,000
Net cash (used in) provided by financing activities	(223,037,000)	404,675,000	266,998,000
Net increase (decrease) in cash and cash equivalents	34,078,000	(2,363,000)	31,335,000
Cash and cash equivalents at beginning of period	147,685,000	150,048,000	118,713,000
Cash and cash equivalents at end of period	181,763,000	147,685,000	150,048,000
Cash paid during the period:
Interest paid	45,702,000	19,993,000	13,848,000
Taxes paid	14,470,000	9,335,000	16,935,000
Non-cash investing and financing activities:
Transfer of loan to available for sale securities			1,000,000
Transfer from loans to other real estate owned	974,000	808,000
Transfer of loans to held for sale, net	107,859,000	186,503,000	165,651,000
Loan to facilitate OREO	623,000	104,000	425,000
Net change in unrealized holding (loss) gain on securities available for sale	$ 2,241,000	$ (1,271,000)	$ (176,000)