Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
NET EARNINGS	$ 89,559us-gaap_NetIncomeLoss	$ 78,868us-gaap_NetIncomeLoss	$ 74,225us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	9,262	8,638	7,920
PROVISION FOR LOAN LOSSES	4,465us-gaap_ProvisionForLoanLossesExpensed	3,753us-gaap_ProvisionForLoanLossesExpensed	3,484us-gaap_ProvisionForLoanLossesExpensed
Securities premium amortization (discount accretion), net	20,221	18,235	15,757
Gain on sale of assets, net	(910)us-gaap_GainsLossesOnSalesOfAssets	(178)us-gaap_GainsLossesOnSalesOfAssets	(2,628)us-gaap_GainsLossesOnSalesOfAssets
Deferred federal income tax expense (benefit)	(893)	754	1,517
Change in loans held for sale	(3,640)	6,292	(827)
Change in other assets	9,852	(6,254)	(5,170)
Change in other liabilities	3,486	(250)	(1,216)
Total adjustments	41,843	30,990	18,837
Net cash provided by operating activities	131,402	109,858	93,062
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash paid for acquisition of bank, less cash acquired		(25,706)
Net decrease in interest-bearing time deposits in banks	14,915	17,088	12,170
Activity in available-for-sale securities:
Sales	1,619	122,025	144,144
Maturities	2,917,407	2,181,684	1,909,635
Purchases	(3,248,804)	(2,525,499)	(2,049,275)
Activity in held-to-maturity securities - maturities	243	377	2,557
Net increase in loans	(247,829)	(320,136)	(306,412)
Purchases of bank premises and equipment and other assets	(17,412)	(11,324)	(16,180)
Proceeds from sale of bank premises and equipment and other assets	4,656	4,721	8,370
Net cash used in investing activities	(575,205)	(556,770)	(294,991)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in noninterest-bearing deposits	208,146	(17,053)	210,132
Net increase in interest-bearing deposits	407,035	133,594	87,654
Net increase (decrease) in short-term borrowings	(96,778)	204,191	51,941
Common stock transactions:
Proceeds from stock issuances	1,437	1,958	824
Dividends paid	(34,578)us-gaap_PaymentsOfDividendsCommonStock	(24,505)us-gaap_PaymentsOfDividendsCommonStock	(38,719)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by financing activities	485,262	298,185	311,832
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	41,459	(148,727)	109,903
CASH AND CASH EQUIVALENTS, beginning of year	212,012	360,739	250,836
CASH AND CASH EQUIVALENTS, end of year	$ 253,471	$ 212,012	$ 360,739

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