CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Cash and due from banks	$ 76,527	$ 85,523
Federal funds sold	1,872	26,398
Interest-bearing deposits at financial institutions	214,160	133,198
Securities held to maturity, at amortized cost	395,302	401,913
Securities available for sale, at fair value	260,447	261,056
Total securities	655,749	662,969
Loans receivable held for sale	1,994	1,295
Loans/leases receivable held for investment	3,797,438	3,731,459
Gross loans/leases receivable	3,799,432	3,732,754
Less allowance for estimated losses on loans/leases	(41,164)	(39,847)
Net loans/leases receivable	3,758,268	3,692,907
Bank-owned life insurance	68,323	67,783
Premises and equipment, net	77,194	75,582
Restricted investment securities	22,904	25,689
Other real estate owned, net	9,110	9,378
Goodwill	77,872	77,832
Intangibles	16,918	17,450
Other assets	87,765	75,001
Total assets	5,066,662	4,949,710
Liabilities and Stockholders' Equity
Noninterest-bearing	821,599	791,102
Interest-bearing	3,372,621	3,185,929
Total deposits	4,194,220	3,977,031
Short-term borrowings	15,886	28,774
Federal Home Loan Bank advances	126,180	266,492
Other borrowings	35,000	67,250
Subordinated notes	68,215	4,782
Junior subordinated debentures	37,713	37,670
Other liabilities	101,041	94,573
Total liabilities	4,578,255	4,476,572
Stockholders' Equity:
Preferred stock, $1 par value; shares authorized 250,000 March 2019 and December 2018- No shares issued or outstanding
Common stock, $1 par value; shares authorized 20,000,000 March 2019 - 15,755,442 shares issued and outstanding December 2018 - 15,718,208 shares issued and outstanding	15,755	15,718
Additional paid-in capital	271,673	270,761
Retained earnings	204,179	192,203
Accumulated other comprehensive loss:
Securities available for sale	(1,131)	(4,268)
Derivatives	(2,069)	(1,276)
Total stockholders' equity	488,407	473,138
Total liabilities and stockholders' equity	$ 5,066,662	$ 4,949,710