Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows From Operating Activities:
Net Income	$ 140,930	$ 176,691	$ 132,217
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	266	(20,821)	45,571
Provision for unfunded commitments	1,477	(1,119)	1,380
Depreciation and amortization	3,319	5,874	4,696
Gains on sale of loans	(3,702)	(14,045)	(22,089)
Gain on MSRs	(837)	(679)	(667)
Securities premium amortization (discount accretion), net	9,011	4,031	8,196
Origination of loans held for sale	(299,317)	(1,156,281)	(1,240,682)
Proceeds from sale of loans held for sale	343,503	1,211,313	1,231,273
Deferred income tax (benefit) expense	6,560	5,770	(8,332)
Net gain on sale of other real estate owned	(248)	(1,266)	(1,180)
Net increase in cash surrender value of BOLI	(2,547)	(2,059)	(2,071)
Net (gain)/loss on sale of investment securities	169	(2,964)	(1,815)
Stock-based compensation expense	9,899	7,811	5,324
Net tax benefits from stock compensation	0	0	118
Increase (decrease) in other assets	(26,162)	1,358	(28,626)
Increase in other liabilities	12,581	24,823	9,826
Net cash provided by operating activities	194,902	238,437	133,139
Cash Flows From Investing Activities:
Purchases of available-for-sale investment securities	(425,263)	(2,029,434)	(739,955)
Proceeds from maturities of available-for-sale securities	261,999	313,921	302,471
Proceeds from sale/call of available-for-sale securities	6,225	201,034	124,144
Purchase of held to maturity investment securities	(290,740)	0	0
Proceeds from maturities from held to maturity securities	115,777	0	0
Proceeds from call of held-to-maturity securities	8,350	0	0
Purchases of Federal Reserve and Federal Home Loan Bank stock	(30,914)	(218)	(9,160)
Proceeds from redemption of Federal Reserve and Federal Home Loan Bank stock	0	6,169	4,250
Net change in loans	(570,977)	511,120	(240,911)
Proceeds from sale of SBA PPP loans	0	170,154	0
Redemption (purchase) of BOLI	338	(30,000)	0
Proceeds from sale of other real estate owned	241	4,618	4,430
Purchases of premises and equipment	(2,113)	(5,286)	(2,945)
Net cash used in by investing activities	(927,077)	(857,922)	(557,676)
Cash Flows From Financing Activities:
Increase (decrease) in deposits	(1,268,358)	792,337	1,964,812
Increase (decrease) in customer repurchase agreements	11,182	(2,808)	(4,254)
Increase in short-term borrowings	675,001	0	50,000
Increase in long-term borrowings	0	0	50,000
Repayment of long-term borrowings	0	(200,000)	0
Proceeds from exercise of equity compensation plans	97	0	63
Proceeds from employee stock purchase plan	748	496	760
Common stock repurchased	(33,087)	(682)	(61,432)
Tax equivalent shares withheld on exercise of equity comp plans	0	0	0
Cash dividends paid	(55,776)	(44,691)	(28,330)
Net cash used in financing activities	(670,193)	544,652	1,971,619
Net (Decrease) Increase In Cash and Cash Equivalents	(1,402,368)	(74,833)	1,547,082
Cash and Cash Equivalents at Beginning of Period	1,714,222	1,789,055	241,973
Cash and Cash Equivalents at End of Period	311,854	1,714,222	1,789,055
Supplemental Cash Flows Information:
Interest paid	90,590	30,989	70,183
Income taxes paid	23,453	54,363	37,400
Non-Cash Investing Activities
Initial recognition of operating lease right-of-use assets	0	9,146	1,696
Transfers of investment securities from available-for-sale to held-to-maturity	922,975	0	0
Transfers from loans to other real estate owned	$ 475	$ 149	$ 6,750