Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows From Operating Activities:
Net Income	$ 152,276	$ 100,232	$ 97,707
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	8,660	8,971	11,331
Depreciation and amortization	6,969	6,883	6,226
Gains on sale of loans	(5,963)	(9,544)	(11,564)
Gains on sale of GNMA loans	(342)	(2,450)
Securities premium amortization (discount accretion), net	4,445	3,986	4,524
Origination of loans held for sale	(325,109)	(707,489)	(857,601)
Proceeds from sale of loans held for sale	337,256	746,016	865,028
Net increase in cash surrender value of BOLI	(1,507)	(1,466)	(1,554)
(Increase) decrease in deferred income tax benefit	(3,497)	18,974	(5,628)
Decrease in value of other real estate owned			200
Net loss (gain) on sale of other real estate owned		301	(682)
Net gain on sale of investment securities	(97)	(542)	(1,194)
Stock-based compensation expense	6,494	5,568	6,907
Net tax benefits from stock compensation	110	460
Excess tax benefits realized from stock compensation			(400)
Increase in other assets	(17,301)	(19,324)	(5,025)
(Decrease) increase in other liabilities	2,061	10,348	8,545
Net cash provided by operating activities	164,455	160,924	116,820
Cash Flows From Investing Activities:
Decrease in interest bearing deposits with other banks and short-term investments			2,496
Purchases of available for sale investment securities	(331,884)	(202,974)	(236,991)
Proceeds from maturities of available for sale securities	93,848	75,922	84,259
Proceeds from sale/call of available for sale securities	36,292	73,079	94,310
Purchases of Federal Reserve and Federal Home Loan Bank stock	(47,872)	(33,008)	(8,502)
Proceeds from redemption of Federal Reserve and Federal Home Loan Bank stock	60,690	18,285	2,125
Net increase in loans	(583,393)	(738,067)	(687,362)
Purchases of BOLI	(10,000)
Proceeds from sale of other real estate owned		2,144	6,139
Bank premises and equipment acquired	(1,482)	(5,758)	(7,426)
Net cash used in investing activities	(783,801)	(810,377)	(750,952)
Cash Flows From Financing Activities:
Increase in deposits	1,120,301	137,870	557,670
(Decrease) increase in customer repurchase agreements	(46,148)	7,685	(3,480)
(Decrease) increase in short-term borrowings	(325,000)	325,000
Increase (decrease) in long-term borrowings			147,586
Proceeds from exercise of equity compensation plans	776	372	955
Excess tax benefits realized from stock compensation			400
Proceeds from employee stock purchase plan	808	836	801
Net cash provided by financing activities	750,737	471,763	703,932
Net Increase (Decrease) In Cash and Cash Equivalents	131,391	(177,690)	69,800
Cash and Cash Equivalents at Beginning of Period	190,473	368,163	298,363
Cash and Cash Equivalents at End of Period	321,864	190,473	368,163
Supplemental Cash Flows Information:
Interest paid	73,806	39,772	24,031
Income taxes paid	$ 55,200	69,200	66,150
Non-Cash Investing Activities
Transfers from loans to other real estate owned		$ 1,145	$ 2,500

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The aggregate amount of cash outflow for loans purchased and created with the intention to resell them in the near future.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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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 net cash inflow or outflow in Interest-bearing Deposits by banks in other financial institutions for relatively short periods of time including, for example, certificates of deposits.

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Amount of cash inflow (outflow) from long-term debt, including capital lease obligations and mandatory redeemable capital securities.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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Amount of cash inflow from sale, 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 resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

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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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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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The cash inflow associated with the amount received from the stock plan during the period.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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