CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities
Net income	$ 49,554	$ 46,779
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	4,628	3,266
Amortization of intangible assets (excluding Mortgage Servicing Rights ("MSR"))	4,506	3,005
Amortization of mortgage servicing rights	1,222	759
Depreciation and amortization of premises and equipment	5,674	4,748
Net amortization (accretion) of premium (discount) on portfolio loans	(5,729)	(6,375)
Net amortization (accretion) of premium (discount) on investment securities	2,843	4,485
Net amortization (accretion) of premium (discount) on time deposits	(802)	(121)
Net amortization (accretion) of premium (discount) on Federal Home Loan Bank ("FHLB") advances and	125	72
Impairment of other real estate owned ("OREO")	18
Impairment of fixed assets held for sale		817
Impairment of MSR	1,822
Change in fair value of loans held for sale, net	(800)
Change in fair value of equity securities, net	800	(1,071)
(Gain) loss on sales of securities, net	184	(160)
(Gain) loss on sale of loans, net	(5,615)	(5,095)
(Gain) loss on sale of OREO	(83)
(Gain) loss on sale of premises and equipment	116	105
(Gain) loss life insurance proceeds	(1,016)
Provision for deferred income taxes	3,816	3,601
Stock-based and non-cash compensation	2,031	1,722
Decrease in deferred compensation	(3,339)
Increase in cash surrender value of bank owned life insurance	(1,970)	(1,228)
Mortgage loans originated for sale	(244,781)	(219,252)
Proceeds from sales of mortgage loans	239,252	285,221
Net change in operating assets and liabilities:
(Increase) decrease in other assets	1,176	1,848
(Decrease) in other liabilities	(16,268)	(11,363)
Net cash provided by operating activities	37,364	111,763
Cash Flows from Investing Activities
Purchases of debt securities held to maturity		(85,050)
Purchases of debt securities available for sale	(227,182)	(93,591)
Purchase of FHLB stock	(3,700)
Proceeds from sales of equity securities	958	920
Proceeds from sales of debt securities available for sale	227,371
Proceeds from paydowns and maturities of debt securities held to maturity	13,922	18,033
Proceeds from paydowns and maturities of debt securities available for sale	146,566	82,817
Proceeds from the redemption of FHLB stock	3,720	2,114
Net cash (received) paid in acquisitions	(49,387)
Net change in loans	(89,642)	(36,080)
Cash paid for premiums on bank-owned life insurance	(3)
Purchases of premises and equipment	(5,918)	(8,594)
Proceeds from life insurance	1,672
Proceeds from disposition of premises and equipment	3	2
Capitalized expenditures on OREO	(2)
Proceeds from sale of OREO	1,119	722
Net cash provided by (used in) investing activities	19,497	(118,707)
Cash Flows from Financing Activities
Net change in deposits	145,499	38,069
Net change in federal funds purchased and securities sold under agreements to repurchase	(45,549)	(64,457)
Proceeds from other borrowings	60,000
Repayment of FHLB advances, net	(2,297)
Repayment of other borrowings	(3,000)	(70,000)
Cash dividends paid	(21,947)	(19,482)
Purchase of treasury stock	(8,433)
Cash paid for withholding taxes on share based payments	(835)	(74)
Proceeds from stock options exercised	169	346
Common stock issuance costs	(234)
Net cash provided by (used in) financing activities	123,373	(115,598)
Net increase in cash and cash equivalents	180,234	(122,542)
Cash and cash equivalents, beginning of period	239,973	353,272
Cash and cash equivalents, ending of period	420,207	230,730
Cash payments for:
Interest	33,122	17,212
Income taxes	10,555	4,322
Non-cash Investing and Financing Activities:
OREO acquired in settlement of loans	1,396	$ 3,125
Transfer of debt securities held to maturity to available for sale	$ 573,639

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

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The net cash inflow or outflow from the fund lent to other financial institution arising from the excess in reserve deposited at Federal Reserve Bank to meet legal requirement. This borrowing is usually contracted on an overnight basis at an agreed rate of interest. Also include cash inflow or outflow from investment sold under the agreement to reacquire such investment.

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Net cash inflow (outflow) of time deposits.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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Amount of unrealized and realized gain (loss) on investment in marketable security, excluding other-than-temporary impairment (OTTI).

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The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The amount of cash paid for the origination of mortgages that are held for sale.

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The cash outflow to reacquire common stock during the period.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Amount of cash outflow to acquire Federal Home Loan Bank (FHLB) stock.

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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Amount of cash outflow for payment of premium on corporate-owned life insurance policy, classified as investing activities. Includes, but is not limited to, bank-owned life insurance policy.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Amount of cash inflow from sale of Federal Home Loan Bank (FHLB) stock.

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of expense related to estimated loss from loan and lease transactions.

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The cash outflow to settle a bank borrowing during the year.

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