Disclosures About Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financial assets:
Securities held-to-maturity	$ 663,292	$ 699,506
Accrued interest receivable	48,739	47,353
Financial liabilities:
Subordinated debt	114,364	114,189
Junior subordinated debentures	129,703	129,574
Derivatives Not Designated as Hedging Instruments
Financial assets:
Derivative assets	48,009	42,772
Financial liabilities:
Derivative liabilities	44,581	42,940
Level 1
Financial assets:
Cash and cash equivalents	228,433	122,260
Securities available-for-sale	0	0
Securities held-to-maturity	0	0
Loans receivable, net	0	0
Loans held-for-sale	0	0
Accrued interest receivable	48,739	47,353
FHLB stock	0	0
Total financial assets	277,172	169,613
Financial liabilities:
Savings and checking deposits	9,261,017	9,377,021
Time deposits	0	0
Borrowed funds	232,254	386,446
Subordinated debt	0	0
Junior subordinated debentures	0	0
Accrued interest payable	21,423	13,669
Total financial liabilities	9,514,694	9,777,136
Level 1 | Interest rate lock commitments
Financial assets:
Derivative assets	0	0
Level 1 | Forward commitments
Financial assets:
Derivative assets	0	0
Level 1 | Foreign exchange swaps
Financial assets:
Derivative assets	0
Financial liabilities:
Derivative liabilities	0	0
Level 1 | Interest rate swap agreements | Derivatives Designated as Hedging Instruments
Financial assets:
Derivative assets	0	0
Financial liabilities:
Derivative liabilities		0
Level 1 | Interest rate swap agreements | Derivatives Not Designated as Hedging Instruments
Financial assets:
Derivative assets	0	0
Financial liabilities:
Derivative liabilities	0	0
Level 1 | Risk participation agreements
Financial liabilities:
Derivative liabilities	0	0
Level 2
Financial assets:
Cash and cash equivalents	0	0
Securities available-for-sale	1,029,191	1,043,359
Securities held-to-maturity	663,292	699,506
Loans receivable, net	0	0
Loans held-for-sale	681	0
Accrued interest receivable	0	0
FHLB stock	0	0
Total financial assets	1,740,382	1,784,996
Financial liabilities:
Savings and checking deposits	0	0
Time deposits	0	0
Borrowed funds	0	0
Subordinated debt	109,224	109,471
Junior subordinated debentures	0	0
Accrued interest payable	0	0
Total financial liabilities	153,805	152,411
Level 2 | Interest rate lock commitments
Financial assets:
Derivative assets	0	0
Level 2 | Forward commitments
Financial assets:
Derivative assets	70	12
Level 2 | Foreign exchange swaps
Financial assets:
Derivative assets	2
Financial liabilities:
Derivative liabilities	25	291
Level 2 | Interest rate swap agreements | Derivatives Designated as Hedging Instruments
Financial assets:
Derivative assets	2,726	713
Financial liabilities:
Derivative liabilities		1,198
Level 2 | Interest rate swap agreements | Derivatives Not Designated as Hedging Instruments
Financial assets:
Derivative assets	44,420	41,406
Financial liabilities:
Derivative liabilities	44,450	41,437
Level 2 | Risk participation agreements
Financial liabilities:
Derivative liabilities	106	14
Level 3
Financial assets:
Cash and cash equivalents	0	0
Securities available-for-sale	0	0
Securities held-to-maturity	0	0
Loans receivable, net	10,270,432	10,274,593
Loans held-for-sale	8,764	8,768
Accrued interest receivable	0	0
FHLB stock	0	0
Total financial assets	10,279,987	10,284,002
Financial liabilities:
Savings and checking deposits	0	0
Time deposits	2,472,360	2,113,177
Borrowed funds	0	0
Subordinated debt	0	0
Junior subordinated debentures	124,292	112,159
Accrued interest payable	0	0
Total financial liabilities	2,596,652	2,225,336
Level 3 | Interest rate lock commitments
Financial assets:
Derivative assets	791	641
Level 3 | Forward commitments
Financial assets:
Derivative assets	0	0
Level 3 | Foreign exchange swaps
Financial assets:
Derivative assets	0
Financial liabilities:
Derivative liabilities	0	0
Level 3 | Interest rate swap agreements | Derivatives Designated as Hedging Instruments
Financial assets:
Derivative assets	0	0
Financial liabilities:
Derivative liabilities		0
Level 3 | Interest rate swap agreements | Derivatives Not Designated as Hedging Instruments
Financial assets:
Derivative assets	0	0
Financial liabilities:
Derivative liabilities	0	0
Level 3 | Risk participation agreements
Financial liabilities:
Derivative liabilities	0	0
Carrying amount
Financial assets:
Cash and cash equivalents	228,433	122,260
Securities available-for-sale	1,029,191	1,043,359
Securities held-to-maturity	784,208	814,839
Loans receivable, net	11,219,849	11,280,798
Loans held-for-sale	9,445	8,768
Accrued interest receivable	48,739	47,353
FHLB stock	20,842	30,146
Total financial assets	13,388,716	13,390,295
Financial liabilities:
Savings and checking deposits	9,261,017	9,377,021
Time deposits	2,826,362	2,602,881
Borrowed funds	242,363	398,895
Subordinated debt	114,364	114,189
Junior subordinated debentures	129,703	129,574
Accrued interest payable	21,423	13,669
Total financial liabilities	12,639,813	12,679,169
Carrying amount | Interest rate lock commitments
Financial assets:
Derivative assets	791	641
Carrying amount | Forward commitments
Financial assets:
Derivative assets	70	12
Carrying amount | Foreign exchange swaps
Financial assets:
Derivative assets	2
Financial liabilities:
Derivative liabilities	25	291
Carrying amount | Interest rate swap agreements | Derivatives Designated as Hedging Instruments
Financial assets:
Derivative assets	2,726	713
Financial liabilities:
Derivative liabilities		1,198
Carrying amount | Interest rate swap agreements | Derivatives Not Designated as Hedging Instruments
Financial assets:
Derivative assets	44,420	41,406
Financial liabilities:
Derivative liabilities	44,450	41,437
Carrying amount | Risk participation agreements
Financial liabilities:
Derivative liabilities	106	14
Estimated fair value
Financial assets:
Cash and cash equivalents	228,433	122,260
Securities available-for-sale	1,029,191	1,043,359
Securities held-to-maturity	663,292	699,506
Loans receivable, net	10,270,432	10,274,593
Loans held-for-sale	9,445	8,768
Accrued interest receivable	48,739	47,353
FHLB stock	20,842	30,146
Total financial assets	12,318,383	12,268,757
Financial liabilities:
Savings and checking deposits	9,261,017	9,377,021
Time deposits	2,472,360	2,113,177
Borrowed funds	232,254	386,446
Subordinated debt	109,224	109,471
Junior subordinated debentures	124,292	112,159
Accrued interest payable	21,423	13,669
Total financial liabilities	12,265,151	12,154,883
Estimated fair value | Interest rate lock commitments
Financial assets:
Derivative assets	791	641
Estimated fair value | Forward commitments
Financial assets:
Derivative assets	70	12
Estimated fair value | Foreign exchange swaps
Financial assets:
Derivative assets	2
Financial liabilities:
Derivative liabilities	25	291
Estimated fair value | Interest rate swap agreements | Derivatives Designated as Hedging Instruments
Financial assets:
Derivative assets	2,726	713
Financial liabilities:
Derivative liabilities		1,198
Estimated fair value | Interest rate swap agreements | Derivatives Not Designated as Hedging Instruments
Financial assets:
Derivative assets	44,420	41,406
Financial liabilities:
Derivative liabilities	44,450	41,437
Estimated fair value | Risk participation agreements
Financial liabilities:
Derivative liabilities	$ 106	$ 14