Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets [Abstract]
Cash and Due from Banks	$ 135,567	$ 141,890
Money market instruments	24,389	25,324
Cash and cash equivalents	159,956	167,214
Available-for-sale Securities	1,209,701	1,003,421
Debt Securities, Held-to-maturity	0	351,808
Other Investments and Securities, at Cost	69,806	72,916
Investments	1,279,507	1,428,145
Total loans	6,501,404	5,692,132
Allowance for loan losses	56,679	51,512
Net loans	6,444,725	5,640,620
Bank Owned Life Insurance	212,529	188,417
Prepaid Expense, Current	101,990	94,079
Goodwill	159,595	112,739
Intangible Assets, Net (Excluding Goodwill)	11,523	6,971
Property, Plant and Equipment, Net	73,322	59,771
Amortization Method Qualified Affordable Housing Project Investments	53,070	50,347
Accrued Investment Income Receivable	24,217	22,974
Other real estate owned	4,029	4,303
Mortgage loan servicing rights	10,070	10,178
Operating Lease, Right-of-Use Asset	13,714	0
Other Assets, Miscellaneous	10,130	18,550
Other Assets	674,189	568,329
Assets	8,558,377	7,804,308
Liabilities [Abstract]
Non-interest bearing	1,959,935	1,804,881
Interest-bearing Deposit Liabilities	5,092,677	4,455,979
Total deposits	7,052,612	6,260,860
Short-term Debt	230,657	221,966
Long-term Debt	192,500	400,000
Subordinated Debt	15,000	15,000
Total borrowings	438,157	636,966
Operating Lease, Liability	14,482	0
Interest Payable	2,927	2,625
Qualified Affordable Housing Project Investments, Commitment	25,894	22,282
Other Liabilities Unclassified	55,291	49,069
Other Liabilities, Total	98,594	73,976
Commitments and Contingencies
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred Stock, Value, Issued	0	0
Common Stock, Value, Issued	459,389	358,598
Accumulated Other Comprehensive Income (Loss), Net of Tax	(9,589)	(49,788)
Retained Earnings (Accumulated Deficit)	646,847	614,069
Treasury Stock, Value	127,633	90,373
Total shareholders’ equity	969,014	832,506
Liabilities and Equity, Total	$ 8,558,377	$ 7,804,308