CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 14,428,000	$ 17,080,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and core deposit intangibles amortization	1,811,000	1,826,000
Provision for loan losses	11,258,000	4,569,000
Excess tax benefit related to the exercise of stock options	(989,000)	(327,000)
Net amortization of premium on investments	2,550,000	2,048,000
Bank owned life insurance	(440,000)	(473,000)
Net accretion of discount on loans	(536,000)	(1,213,000)
Net amortization of discount on subordinated debentures	81,000	80,000
Net amortization of discount on certificates of deposit	(3,000)	(228,000)
Net gain on sale or write down of premises, equipment and other real estate	0	(60,000)
Net gain on sale of branch assets	0	(2,050,000)
Federal Home Loan Bank stock dividends	(201,000)	(60,000)
Stock based compensation expense	1,294,000	1,078,000
Increase in accrued interest receivable and other assets	(4,091,000)	(3,461,000)
Increase in accrued interest payable and other liabilities	2,052,000	2,483,000
Net cash provided by operating activities	27,214,000	21,292,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities and principal paydowns of available for sale securities	2,007,007,000	2,564,916,000
Proceeds from sales of available for sale securities	9,000,000	0
Purchase of available for sale securities	(2,019,843,000)	(2,706,773,000)
Net change in total loans	(314,816,000)	(168,108,000)
Purchase of bank premises and equipment	(1,517,000)	(590,000)
Proceeds from sale of bank premises, equipment and other real estate	1,050,000	0
Net purchases of Federal Home Loan Bank stock	586,000	(9,309,000)
Net cash paid for the sale of branch assets	0	(5,250,000)
Net cash used in investing activities	(318,533,000)	(325,114,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in noninterest-bearing deposits	119,200,000	(9,514,000)
Net increase in interest-bearing deposits	297,235,000	177,873,000
Proceeds from borrowed funds	25,000,000	231,000,000
Paydowns on borrowed funds	(103,000,000)	(20,000,000)
Proceeds from the issuance of common stock, stock option exercises, restricted stock awards and the ESPP	3,213,000	1,076,000
Issuance of treasury stock	0	38,000
Net cash provided by financing activities	341,648,000	380,473,000
NET CHANGE IN CASH AND CASH EQUIVALENTS	50,329,000	76,651,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	142,098,000	148,431,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	192,427,000	225,082,000
SUPPLEMENTAL INFORMATION:
Income taxes paid	6,000,000	9,100,000
Interest paid	$ 10,929,000	$ 2,541,000