Securities (Schedule of Contractual Maturities of Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 1,524,555	$ 1,566,779
Available for Sale, Fair Value
Debt Securities, Available-for-Sale, Excluding Accrued Interest	1,353,744	1,399,154
Held to Maturity, Fair Value
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	1,594,279	1,705,120
Held to Maturity, Fair Value, Total	1,384,430	1,524,710
Available for Sale Securities and Held to Maturity Securities Amortized Cost	3,118,834
Debt Securities, Available-for-sale and Held-to-maturity	2,738,174
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	207,026
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	202,457
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	1,406,657
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	1,263,225
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	544,151
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	458,222
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost	961,000
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Ten Years, Fair Value	814,270
U.S. government agency securities
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	166,540
Available for Sale, Amortized Cost, Due after five to ten years	63,847
Available for Sale, Amortized Cost, Due after ten years	0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	230,387	230,936
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	145,530
Available for Sale, Fair Value, Due after five to ten years	53,980
Available for Sale, Fair Value, Due after ten years	0
Debt Securities, Available-for-Sale, Excluding Accrued Interest	199,510	202,300
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	29,961
Held to Maturity, Amortized Cost, Due after five to ten years	0
Held to Maturity, Amortized Cost, Due after ten years	0
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	28,342
Held to Maturity, Fair Value, Due after five to ten years	0
Held to Maturity, Fair Value, Due after ten years	0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	29,961	31,258
Held to Maturity, Fair Value, Total	28,342	29,036
Small Business Administration Pooled Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	54,830
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	54,830	59,470
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	45,763
Debt Securities, Available-for-Sale, Excluding Accrued Interest	45,763	51,757
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	0
Held to Maturity, Amortized Cost, Due after five to ten years	6,305
Held to Maturity, Amortized Cost, Due after ten years	125,864
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	0
Held to Maturity, Fair Value, Due after five to ten years	5,628
Held to Maturity, Fair Value, Due after ten years	114,655
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	132,169	136,830
Held to Maturity, Fair Value, Total	120,283	130,918
Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	207,026
Available for Sale, Amortized Cost, Due after one year to five years	928,505
Available for Sale, Amortized Cost, Due after five to ten years	162,846
Available for Sale, Amortized Cost, Due after ten years	226,178
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	202,457
Available for Sale, Fair Value, Due after one year to five years	826,512
Available for Sale, Fair Value, Due after five to ten years	135,755
Available for Sale, Fair Value, Due after ten years	189,020
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	478,152
Held to Maturity, Amortized Cost, Due after five to ten years	381,305
Held to Maturity, Amortized Cost, Due after ten years	734,822
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	436,713
Held to Maturity, Fair Value, Due after five to ten years	322,467
Held to Maturity, Fair Value, Due after ten years	625,250
Held to Maturity, Fair Value, Total	1,384,430
Pooled trust preferred securities issued by banks and insurers
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	1,204
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	1,204	1,203
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	1,043
Debt Securities, Available-for-Sale, Excluding Accrued Interest	1,043	1,034
Single Issuer Trust Preferred Securities Issued by Banks and Insurers
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	1,500
Held to Maturity, Amortized Cost, Due after five to ten years	0
Held to Maturity, Amortized Cost, Due after ten years	0
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	1,335
Held to Maturity, Fair Value, Due after five to ten years	0
Held to Maturity, Fair Value, Due after ten years	0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	1,500	1,500
Held to Maturity, Fair Value, Total	1,335	1,508
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	194
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	194	193
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	184
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	0
Debt Securities, Available-for-Sale, Excluding Accrued Interest	184	191
Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	0
Available for Sale, Amortized Cost, Due after one year to five years	0
Available for Sale, Amortized Cost, Due after five to ten years	3,010
Available for Sale, Amortized Cost, Due after ten years	34,149
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	37,159	41,874
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	0
Available for Sale, Fair Value, Due after one year to five years	0
Available for Sale, Fair Value, Due after five to ten years	2,681
Available for Sale, Fair Value, Due after ten years	30,968
Debt Securities, Available-for-Sale, Excluding Accrued Interest	33,649	38,843
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	43,985
Held to Maturity, Amortized Cost, Due after five to ten years	40,959
Held to Maturity, Amortized Cost, Due after ten years	405,067
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	40,115
Held to Maturity, Fair Value, Due after five to ten years	35,101
Held to Maturity, Fair Value, Due after ten years	328,928
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	490,011	535,971
Held to Maturity, Fair Value, Total	404,144	458,417
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	7,100
Available for Sale, Amortized Cost, Due after one year to five years	87,234
Available for Sale, Amortized Cost, Due after five to ten years	95,989
Available for Sale, Amortized Cost, Due after ten years	135,995
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	326,318	359,068
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	7,047
Available for Sale, Fair Value, Due after one year to five years	77,321
Available for Sale, Fair Value, Due after five to ten years	79,094
Available for Sale, Fair Value, Due after ten years	111,246
Debt Securities, Available-for-Sale, Excluding Accrued Interest	274,708	313,688
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	303,005
Held to Maturity, Amortized Cost, Due after five to ten years	333,049
Held to Maturity, Amortized Cost, Due after ten years	203,891
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	279,374
Held to Maturity, Fair Value, Due after five to ten years	280,954
Held to Maturity, Fair Value, Due after ten years	181,667
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	839,945	898,927
Held to Maturity, Fair Value, Total	741,995	815,952
US Treasury Securities [Member]
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Due in one year or less	199,926
Available for Sale, Amortized Cost, Due after one year to five years	674,537
Available for Sale, Amortized Cost, Due after five to ten years	0
Available for Sale, Amortized Cost, Due after ten years	0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	874,463	874,035
Available for Sale, Fair Value
Available for Sale, Fair Value, Due in one year or less	195,410
Available for Sale, Fair Value, Due after one year to five years	603,477
Available for Sale, Fair Value, Due after five to ten years	0
Available for Sale, Fair Value, Due after ten years	0
Debt Securities, Available-for-Sale, Excluding Accrued Interest	798,887	791,341
Held to Maturity, Amortized Cost
Held to Maturity, Amortized Cost, Due in one year or less	0
Held to Maturity, Amortized Cost, Due after one year to five years	99,701
Held to Maturity, Amortized Cost, Due after five to ten years	992
Held to Maturity, Amortized Cost, Due after ten years	0
Held to Maturity, Fair Value
Held to Maturity, Fair Value, Due in one year or less	0
Held to Maturity, Fair Value, Due after one year to five years	87,547
Held to Maturity, Fair Value, Due after five to ten years	784
Held to Maturity, Fair Value, Due after ten years	0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	100,693	100,634
Held to Maturity, Fair Value, Total	$ 88,331	$ 88,879