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Investment Securities - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available for sale securities
Amortized Cost	$ 2,343,573	$ 1,807,389
Gross Unrealized Gains	81,181	112,079
Gross Unrealized Losses	19,186	349
Fair Value	2,405,568	1,919,119
Held to maturity securities
Amortized Cost	1,295,534	1,227,668
Allowance for Credit Losses	245	0
Net Carrying Amount	1,295,289	1,227,668
Gross Unrealized Gains	35,004	52,877
Gross Unrealized Losses	11,758	252
Fair Value	1,318,780	1,280,293
U.S. Treasury
Available for sale securities
Amortized Cost	1,000
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	1,000
U.S. Government-sponsored agency securities
Available for sale securities
Amortized Cost	11,504	2,380
Gross Unrealized Gains	40	50
Gross Unrealized Losses	163	0
Fair Value	11,381	2,430
Held to maturity securities
Amortized Cost	60,676	31,087
Allowance for Credit Losses	0	0
Net Carrying Amount	60,676	31,087
Gross Unrealized Gains	1	10
Gross Unrealized Losses	1,553	113
Fair Value	59,124	30,984
State and municipal
Available for sale securities
Amortized Cost	1,301,378	1,168,711
Gross Unrealized Gains	67,438	89,420
Gross Unrealized Losses	2,654	246
Fair Value	1,366,162	1,257,885
Held to maturity securities
Amortized Cost	624,553	619,927
Allowance for Credit Losses	245	0
Net Carrying Amount	624,308	619,927
Gross Unrealized Gains	23,154	34,978
Gross Unrealized Losses	3,389	32
Fair Value	644,318	654,873
U.S. Government-sponsored mortgage-backed securities
Available for sale securities
Amortized Cost	1,025,660	632,267
Gross Unrealized Gains	13,550	22,505
Gross Unrealized Losses	16,347	103
Fair Value	1,022,863	654,669
Held to maturity securities
Amortized Cost	608,805	575,154
Allowance for Credit Losses	0	0
Net Carrying Amount	608,805	575,154
Gross Unrealized Gains	11,849	17,889
Gross Unrealized Losses	6,816	107
Fair Value	613,838	592,936
Corporate obligations
Available for sale securities
Amortized Cost	4,031	4,031
Gross Unrealized Gains	153	104
Gross Unrealized Losses	22	0
Fair Value	4,162	4,135
Foreign investment
Held to maturity securities
Amortized Cost	1,500	1,500
Allowance for Credit Losses	0	0
Net Carrying Amount	1,500	1,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 1,500	$ 1,500

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